Set of 2.5 mm diameter hex shank drill bits. The 4-piece set includes bits for drilling pilot holes for screw sizes #6, #10, #13, and #16. The standard 2.5 mm hexagon drill shank is compatible with quick change chucks. Function: Designed to drill screw holes accurately and maintain alignment, ideal for applications requiring precise pilot holes. Specially designed for use with plywood and other wood materials. Drilling depth can be adjusted for different screw lengths by loosening and tightening the grub screw. Material: High Speed Steel. Suitable for use with pliers or a drilling machine. Ideal for drilling in hardwood, wooden floors, and for use with wood screws and machine screws. Product size: #6: 65 x 6.3 mm #10: 70 x 6.3 mm #13: 79 x 6.3 mm #16: 89 x 6.3 mm Product color: Black Package quantity: Four pieces