Package Includes: 6pcs Countersink Drill Bit. 6 Sizes: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm. Different sizes can meet your different drilling needs. High Quality Material: Made of high speed steel. Wide range of applications, longer service life, can be used for cutting thin metal, wood, etc. 90 Degree Design: The countersink drill bit set provides a smooth three-edge cut and can eliminate burrs. Widely Application: It can be used to cut through aluminum, copper, stainless steel, aluminum plates, insulation boards and PVC sheets, etc. 6Pcs Countersink Drill Bit Metal Countersink Wood HSS Chamfering Bit 90 Degree Chamfering Cutter Metal Chamfering Tool for DIY Home and General Construction Specification: Product Name: Countersink Drill Material: High Speed Steel Size: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm Quantity: 6pcs (1pc of each size) Color: Sliver Feature: Chamfering with a groove makes it easy to discharge debris and can perform chamfering, deburring and taper processing. Package Content: 6pcs * Countersink Drill Bits Note: 1.Due to manual measurement, please allow a deviation of 1-2mm. 2.Please feel free to contact us if the product you received is defective or you are not satisfied with our product, we will solve the problem for you in time.