_x000D_ Main Features _x000D_ Square Hole Drill Sleeve: The force of the drill sleeve blade is effectively protected on a flat surface, which can avoid bursting at the beginning. Alloy Drill Bit: The drill bit is forged from alloy and has high overall heat treatment hardness. U-Shaped Chip Discharge Chute: The U-shaped chip discharge chute facilitates the discharge of wood chips and improves the drilling rate. Universal Round Handle: More stable clamping, suitable for square hole machines, square tenon machines, hand electric drills, etc. _x000D_ _x000D_ Highlight description _x000D_ [Premium Carbide Material] The square hole drill bit adapter is crafted from carbide, sturdy and durable, which can hold wood firmly. It is about 6.3inch/16cm long, the upper inner diameter is about 0.75inch/1.9cm, and the lower diameter is about 2.17inch/5.5cm, reducing the use error. The drill bit will not be blocked by sawdust, which has high hardness, not roll, and has fast cutting speed. It is sharp, please take it out safely. [Easy to Use] The square hole drill bit adapter and drill bit set is easy to use. The precision design of the drill press mortise attachment ensures you can drill the correct mortises and tenons in the fastest way. It is more convenient and fast than mortise machine. [Suitable for Bench Drills and Hand Drills] The dual support bracket is reliable and practical, suitable for bench drills and hand drills. It is ideal for woodworking, furniture manufacturing and other related industries. [Widely Uses] You can combine the square hole drill bit adapter with 4 square hole drill bits and this simplifies the process of drilling square holes on wooden boards. It fits for construction, woodworking DIY, decoration industries, materials with lower hardness such as compressed board, plastic, density board, sandalwood, pine, ash, pine, etc. _x000D_ _x000D_ SpecificationType1 _x000D_ Product Name: Square Hole Drill Bit Adapter Material: Carbide Specifications: 6.4/8/9.5/12.7mm Shank diameter: 19mm Color: Silver _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ SpecificationType2 _x000D_ Product name: Square Hole Drill Bit Adapter Type: Fixer Material: aluminium Colour: silver Size: 15cm Diameter: 53mm Maximum cutting depth: 10mm _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ SpecificationType3 _x000D_ Product Name: Square Hole Drill Bits Set Material: High Speed Steel Color: Silver Size: Drill Bit Diameter: 6/25inch (6mm), 1/4inch (6.4mm), 5/16inch (8mm), 3/8inch (9.5mm), 2/5inch (10mm), 1/2inch (12.7mm), 9/16inch (14mm) _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ Parts List _x000D_ Type1: 1Fixed Bracket 4Square Hole Drill Bits Type2: 1 x Square Drill Holder 2 x Wrenches 2 x Plastic Washer Type3: 7Square Hole Drill Bits _x000D_ _x000D_ Notes _x000D_ 1.If you have any questions after sales, please contact us and our service team will provide you with professional and satisfactory service. 2.There may be slight differences between the product pictures and the actual color. We will try our best to show you the exact color. _x000D_ _x000D_ _x000D_