Features: *The hexagonal shank design ensures a secure grip and prevents slipping during use. *Countersink drill is well designed in five-blade, which can reduce vibration and prolong life, achieve smoother drilling. *Precision grinding 82°tip for drilling holes, it is used for most medium hardness stainless steel, metals, plywood, softwood, hardwood, fiberglass plastic,mild steel copper, aluminum. *Including 5 most sizes: 1/4, 3/8, 1/2, 5/8, 3/4 inch counter sink drill bits. Specifications: *Product name: Countersink Drill Bit *Color: Yellow and silver *Material: HSS *Size: as pictures show *Type: Hexagonal, Round(Optional) *Quantity: 5pcs Package Content: 5* Drill Bit Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data. The hexagonal shank design ensures a secure grip and prevents slipping during use. Countersink drill is well designed in five-blade, which can reduce vibration and prolong life, achieve smoother drilling. Precision grinding 82°tip for drilling holes, it is used for most medium hardness stainless steel, metals, plywood, softwood, hardwood, fiberglass plastic,mild steel copper, aluminum. Including 5 most sizes: 1/4, 3/8, 1/2, 5/8, 3/4 inch counter sink drill bits. Specifications: Product name: Countersink Drill Bit