Multi-specification woodworking saw teeth-complete specifications, sharp and durable, and a set containing sizes is more convenient to use. High-quality industrial-grade drill bit-heat-resistant, wear-resistant and high-quality steel, high-speed steel material is durable Matching installation tool-simple, convenient and fast operation, matching the conversion head of the handle part. Simple and convenient set box-equipped with storage box, easy to store high-end atmosphere, convenient for products to carry beautifully and conveniently. Suitable for punching holes in wooden boards and thin iron sheets, and can be used for wood, plastic, aluminum skin, iron sheet, PVC, gypsum board and other materials. Name: woodworking drill hole opener set Specification of hole opener: 19/22/29/35/38/44/51/57/64(mm) pay attention to 1. The material of the hole must be fixed without moving, and it should form a 90-degree angle with the hole opener. 2. The power of hand electric drill should be 750W, and impact drill is prohibited. Colour:red+black Material:Metal+plastic Package Contents: 1 x Woodworking drill hole opener set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.