4 PCS Hex Shank Countersink Drill Bits For Wood Ideal Carpentry Reamer Tool Set for furniture assembly, house maintenance, DIY work and other home use;Great Tool for Hobbyists, Modelers or for Professional use, such as Builders and Electricians etc.PACKAGE INCLUDES:4 PCS Countersink Drill Bits: 3mm, 3.5mm, 4mm, 4.5mm; APPLICATIONS:Apply to wooden planks, fiberboard, particle board, plywood, plastic, aluminum board, PVC board and more;PRODUCT SPECIFICATIONS:MATERIAL:High Speed Steel 4241SHANK TYPE:Hex ShankSHANK SIZE:1/4 Inch