Includes five different sizes of countersunk drill bits: 4.4 x 12.7 mm, 4.8 x 12.7 mm, 4 x 9.5 mm, 3.6 x 9.5 mm, and 3.2 x 9.5 mm (11/64 inch, 3/16 inch, 5/32 inch, 9/64 inch, and 1/8 inch drill bits) with 1/4 inch hex shank. Made of high-performance, wear-resistant alloy with an internal bearing and an O-ring at the front end to prevent damage to the workpiece. Non-penetrating design for increased efficiency; features cross-reference scale for adjustable drilling length to accommodate different screw lengths. Designed to complete drilling, countersunking, and chamfering in one step, with an 82-degree chamfer angle for perfect screw holes in both hardwood and softwood. Fast drilling with a spiral flute guide for rapid chip removal; easily mounted on countersunk/guided drills using a hex wrench. This set includes five different sizes of countersunk drill bits, as well as a hex wrench, a Phillips screwdriver bit, and a tool box. The countersunk drill bits with depth limiters feature an internal bearing and an O-ring at the front end. When the drill bit is lowered into the hole, the O-ring prevents the drill bit from rotating further, thus preventing damage to the workpiece. Color: Blue Material: Alloy Package Contents: 1 set of countersunk drill bits 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.