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Product characteristics:
1. Direct selling at factory price, reliable quality.
2. Whole branch heat treatment, HRC 48-50, high hardness.
3. The drill core is lengthened with high concentricity.
4. Cooperate with square tenon machine. If square hole is opened manually, hand drill and hammer are needed.
Product Specification:
1/4 "(6.35 mm), 5/16" (7.94 mm), 3/8"(9.5 mm), 1/2" (12.7 mm).
The dimension refers to the side length of the square hole drilled by the square hole drill.
The cylindrical diameter of the clamping part is 19 mm.
The square hole drill cores sold by our shop are all over 210 mm, belonging to the extended drill cores.
Product weight:
1/4"(6.35mm) - 135g
5/16"(7.94 mm) - 140 grams
3/8"(9.5mm) - 160g
1/2"(12.7mm) - 215g


We are a professional manufacturer engaged in R&D, production, sales and service of step drills, twist drills, taps, saw blades and chamfers. In recent years, our company has introduced a series of advanced equipment including C N C lathe, C N C milling machine, edging and polishing machine, environmental protection vacuum equipment. All the products sold are in stock, fast delivery and professional. We also welcome O E M and ODM orders.
Whether selecting a current product from our catalog or seeking engineering assistance for your application, you can talk to our customer service center about your sourcing requirements. We warmly welcome customers from at home and abroad to cooperate with us for common success.

Trade Assurance
Alibaba.com's free order protection service.
1. Customizable design 1. OEM, ODM is available
2. High quality with competitive price 2. Sample order
3. Prompt delivery with good service 3. Prompt response in 24 hours for any inquiry
4. All the products sold are in stock
A: We are a comprehensive manufacturer.
Q: How long is your delivery time?
A: In usual,it would only need 5-15 days to finish!
Q: Do you provide samples ? Is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: Can we get one sample to confirm before order?
A: Yeah,it would be no problem to get one sample to confirm before both of us agree on the price!
Q:What is your after service?
A:We always commit to what we promise to clients,in case there are any quality issues occur within the warrant period that by ourside,we will take our responsibility.
Q: Can you do customized packaging (with designs on them) for individual retail selling? What is the per unit cost?
A: Yes, sure. Your special design is welcome. The unit cost depends on the color and size of your design. Please send us your design for quotation.
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