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Main Features: - Made of high-speed steel. Heat treatment. HRC48 - 50. Offers high hardness, lengthened core, and high concentricity - Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects - Durable, exquisite workmanship, for efficient performance and long life - 6 pieces a pack with different slot diameter to meet your needs - Professional drill bit, suitable for construction, installation, renovation, decoration industry, etc Specifications: Clamping shank diameter: 19mm Shank type: round handle Cooling type: external cooling Application: work with square hole machine Slot diameter: 1/4 inches (6.35mm), 5/16 inches (8mm), 3/8 inches (9.5mm), 1/2 inches (12.7mm), 9/16 inches (14mm), 5/8 inches (16mm) Package weight: 1.192 kg Package Size(L x W x H): Package Size(L x W x H): 24.00 x 9.50 x 6.00 cm / 9.45 x 3.74 x 2.36 inches Package Contents: 6 x Square Hole Drill Bit Product Safety Disclaimer: We do not accept any responsibility or liability for misuse of this or any other product. All our products are extensively tested to comply with rigorous and strict QC standards. Professional Services: If you have any doubts about our products, please feel free to contact us. After you receive the product, if you have any question about the use of methods and product performance, we will provide you with professional, caring sales service. We offer a 60-day refund guarantee.