7 PCS Drill Bit Set High-Speed Steel Drill Adjustable Carpentry Reamer with One Hex Key for Woodworking (3-10mm) Product selling point: Drill Bit Set make of Heat treated & tempered high-carbon steel with Titanium Nitrate coating for superior cutting power. The three-Pointed design can quickly and accurately drill a smooth hole. And the five-edged chamfer design will fast discharge chips from the hole on both sides automatically. You can drilling length of the countersink drill bits set can be adjusted for various length screws simply by loosening and tightening the screw. The countersink drill bits set have Dia 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm 7 x chamfer drill and 1 piece of hex key. High hardness, good abrasion resistance, durable. Perfect for drilling machines with chuck, for drilling on hard wood or wooden floor. The countersink drill bits set are applicable to bench drill, hand drill etc. Product parameters: Material: high speed steel 4241 Chamfer diameter: 15.8mm Specifications: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm (diameter of three-point woodworking drill) Package Included: 1x 7 PCS Drill Bit Set 1x Hex Key