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The average lead time is one month for both peak and off-peak seasons.

Does the product come with a warranty?

The product undergoes 100% visual and function inspection before delivery.

Hollow Core Dry Diamond Core Drill Bits for Hard Rock

Name: Hollow Core Dry Diamond Core Drill Bits for Hard Rock
Brand: Johnson Tools Manufactory Co., Ltd.
SKU: 1911187635

Jiangsu, ChinaJohnson Tools Manufactory Co., Ltd.

US$13.40

10-99 Pieces

US$13.00

100+ Pieces

Sample price:US$13.40/piece.Request sample

Product profile

Customized

Standard

SGS,GB

Length

104mm

Model NO.

D05D20M14G

Type

Core Drill Bit

Material

Diamond

Usage

Masonry Drilling, Stone, Granite

Diameter

20mm

Total Length

104mm

Segment Height

10mm

Thread

M14 or 5/8"-11

Technology

Laser Welded

Application

Dry Drilling

Delivery Date

15-20days

MOQ

20PCS

Transport Package

Aluminum Box Packaging

Specification

20mm

Trademark

Johnson Tools

Origin

China

Production Capacity

10000PCS/Month

Key features

Vacuum Brazed Protection: Offers clean cut and steel core protection for diamond dry core bit.

Hard Rock Drilling: Designed for drilling granite, engineered stone, limestone, and marble.

Waterless Operation: Can drill through toughest granite or engineered stone countertop without water.

High-Speed Compatibility: Fits on a high-speed angle grinder for best cutting performance.

Laser Welded Technology: Utilizes laser welding for durable segment attachment.

Full Customization: Offers full customization, minor customization, and flexible customization options.

OEM and ODM Services: OEM and ODM services are available for custom designs and samples.

100% Quality Inspection: Finished products undergo 100% visual and function inspection.

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: ≤4.59h

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.