What is the working length and diameter of the drill bit?

The working length is 40mm and the diameter is 20mm.

Granite Marble Quartz Sink Vacuum Brazed Zero Tolerance Grinding Diamond Drum Wheels

Name: Granite Marble Quartz Sink Vacuum Brazed Zero Tolerance Grinding Diamond Drum Wheels
Brand: Johnson Tools Manufactory Co., Ltd.
SKU: 1915131165

Jiangsu, ChinaJohnson Tools Manufactory Co., Ltd.

US$12.00

100-499 Sets

US$11.50

500+ Sets

Sample price:US$12.00/piece.Request sample

Product profile

Customized

Standard

SGS,GB

Length

40mm

Model NO.

OT11T08D20

Type

Core Drill Bit

Material

Diamond

Usage

Masonry Drilling

Thread

M14 or 5/8"-11 or 1/2 Gas

Method

for Polishing Rough Holes After Drilling

Technology

Vacuum Brazed

Diameter

20mm

Application

Granite/Marble/Tile

Working Length

40mm

Delivery Date

Around 15days

Transport Package

White Box, Blister Card Packing.

Specification

20mm

Trademark

Johnson Tools

Origin

China

Production Capacity

30000PCS/Month

Key features

Vacuum Brazed Technology: Diamonds firmly brazed to center for efficient, high-speed grinding compared to sintered tech.

High Durability & Aggression: More aggressive performance and durable structure for extended tool life.

Crack Risk Reduction: Useful to reduce cracking risk with standard and large format stone materials.

Precision Edge Finishing: Improves edge finishing of exposed holes and shapes arcs or ovals.

Eco-Friendly Production: Environmental protection process with no pollution during manufacturing.

Versatile Stone Application: Ideal for grinding/polishing granite, marble, quartz, limestone, and tiles.

Zero Tolerance Grinding: Designed for zero tolerance grinding on diamond drum wheels.

Company profile

Years of Export ExperiencePatents AwardedFast DeliveryOEM Services

Johnson Tools Manufactory Co., Ltd.

Jiangsu, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 17 Years CertifiedNearest Port: Shanghai Port, Ningbo, QingdaoAverage Response Time: ≤4.53h

AI-Powered supplier vetting

SummaryThe supplier provides OEM and ODM services and supports extensive customization, including sample-, design-, full-, minor-, and flexible customization. It has 17 years of export experience, self-managed import/export rights, 90% export sales, and accepts multiple trade and payment terms. Production is conducted on one line, supported by 11–20 quality-control staff and stated advanced equipment and checking systems. However, no management-system certifications, SDK, new products in the past year, overseas service facilities, or offline trade-show participation are reported. Service procedures and complaint handling lack written records, and production batches are not continuously reconciled. Financial and cash-flow evidence is limited to year labels, so financial credibility cannot be conclusively assessed.

Supplier typeThe supplier is an OEM/ODM manufacturer with its own factory location, one production line, stated production output, advanced equipment, and a technical workforce. It also provides export services directly through self-managed import/export rights, indicating a manufacturing-oriented supplier rather than a pure trading intermediary.

CertificationsThe supplier’s certification of management systems is explicitly listed as NIL. This is a stated absence of certification evidence and represents a deficiency for this field.

After-Sales capabilityThe supplier has a complaint-handling procedure, but no written records, and it lacks written service-assessment and corrective/preventive-action procedures or records. It also reports no overseas warehouses, showrooms, agents, branches, or offline trade-show participation, limiting documented overseas service support.

R&D capabilityThe supplier provides ODM and broad design customization, but reports no available SDK and no new products during the past year. These explicit limitations outweigh the design-service evidence when assessing demonstrated recent innovation capability.

Production capacityThe supplier reports one production line, 11–20 quality-control staff, advanced production and checking equipment, and flexible export fulfillment with one-month lead times in both peak and off-season. However, it does not continuously reconcile quantities for each batch or mass production, so production controls are not fully documented.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization, and also offers ODM services. This is strong direct evidence of broad customization capability.

Product Q&A

Q:What is the main advantage of vacuum brazed technology over sintered?

Vacuum brazed technology firmly bonds diamonds to the center of the milling bits, resulting in more efficient and high-speed grinding compared to sintered technology.

Q:What materials can this diamond drum wheel be used on?

It is suitable for grinding or polishing granite, marble, quartz, limestone, and tiles.

Q:What is the minimum order quantity (MOQ)?

The minimum order quantity is 100 pieces.

Q:What is the typical delivery time for this product?

The delivery date is around 15 days.

Q:Is OEM or ODM service available?

Yes, both OEM and ODM services are available, including customization from samples, designs, and full customization.