Check the listing for details. 5 x Adjustable Countersink Drill Bits Set For Home Repairs Craftsmanship DIY. Condition: New, Made in China. Listed at 10.96 USD. Features: 1.Material:Made of high-quality HSS steel. 2.Size:5 different drill diameter sizes: 2.8mm, 3mm, 3.2mm, 3.5mm, 4mm, counter-bore diameter size: 10mm. 3.Use the accompanying hex wrench to remove the screws and adjust the length of the countersink hole to adjust the drilling depth of various length screws, improving work efficiency. 4.Suitable for drilling machines with chucks such as lithium electric drills, hand drills, bench drills, etc. It is recommended to use a center punch for positioning before drilling, and keep the drill vertical to prevent the drill from bending or breaking. 5.Provides precise, clean pilot holes in compressed board, plastic, MDF, pine and more. Counter sink bits designed as to work as wood drill bits, perfect for woodworker.