Ask a QuestionSpecification:Material: 4241 high speed steelLength: approx. 56.24mm, 60.56mm, 65.60mm, 70.15mm, 74.37mmKey length: approx. 50mmAsk a questionFeature:Specially designed steel counter sleeve countersinks or pilot hole counter. Adjustable depth of the meter sleeve with a wrench. Drill bits and countersinks for wood screws without bits. Easy to use. The drilling length can be adjusted for screws of different lengths simply by loosening and tightening the set screw. Countersink or counter hole clean, smooth holes for bolts and fasteners. High strength and hardness. to use. For use in wood and plastic. Package Included:1x6 #2.38mm for Drilling & Chamfering1x8 #2.78mm for Drilling & Chamfering1x10 #3.175mm for Drilling & Chamfering1x12 #3.56mm for Drilling & Chamfering1x14 #3.97mm for Drilling & Chamfering1 x WrenchNote:Please allow 1-5mm errors due to manual measurement. The item color displayed in photos may be showing slightly different on your computer monitor because monitors are not calibrated same. Payment1) we accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow.2) payment must be made within 3 days of placing the order.3) if you are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. Shipping1.