10Mm Shank Countersink Drill Bit Set 2.8-4Mmtapered Drill Bits Woodworking ??Sturdy and Durable?The countersink drill bit set is made of high speed steel,alloy and tungsten steel drill bits.The countersink drill bits are sharp and wear-resistant.The 45# steel shank has higher strength,anti-deformation ability,durable and not easy to break ??Package Includes?The counter sinker drill bit set includes 5pcs countersink bits and 5pcs allen wrenches.There are 5 different countersink drill diameter sizes:2.8mm(7/64"),3mm(15/128"),3.2mm(1/8"),3.5mm(9/64"),4mm(5/32"),counterbore diameter:10mm (3/8").A variety of different sizes to meet your work needs ??Removable and Adjustable?The countersink drill bit set for wood include allen wrench,which can be used to adjust the depth of the countersink socket and the drilling depth of various length screws.The tapered drill bits can be disassembled and replaced with other suitable drill bits.The countersink bit is very convenient to install and disassemble, and has strong applicability ??Applicability?The counter sinker drill bits are suitable for MDF,compressed board,plastic,pine,walnut and other wood materials.Prohibited materials: concrete, stainless steel, ceramic, glass ??Compatibility?The counter sinker drill bit set for wood is compatible with bench drills,hand drills,rechargeable drills,row drills and other drilling machines.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.The center drill cannot be adjusted too long,otherwise it is easy to shake and cause the drill core to break