Rokrou Countersink Drill Bit Set Wood Drill Bit M2 HSS Titanium 11PCS Drill Bit Set #4(7/64″) #6(9/64″) #8(11/64″) #10(3/16″) #12(7/32″) – 1 Hex Wrench(1/8″) 1/4″ Quick Change Shank – Tapered Drill Bit with 5 Adjustable Countersink Bore for Woodworking â€

Rokrou 11PCS tampered Countersink Drill bit is made of the most popular High Speed Steel, it has superior properties, including high toughness and good cutting. This set is a must have for woodworking at home or in your workshop. Tampered design makes it easier to locate and accurately drill the hole.
Countersink #4 Bit Diameter 7/64″ (2.8mm) , counterbore size and plug size 3/8″ –
Countersink #6 Bit Diameter 9/64″ (3.6mm) , counterbore size and plug size 3/8″ –
Countersink #8 Bit Diameter 11/64″ (4.4mm) , counterbore size and plug size 3/8 inch –
Countersink #10 Bit Diameter 3/16″ (4.8mm), counterbore size and plug size 3/8″ –
Countersink #12 Bit Diameter 7/32″ (5.6mm) , counterbore and plug size 1/2″.
All of them have the shank size 1/4″. Drill, countersink and counterbore in 1 step.
#45 Carbon Steel adjustable four-cutter counter bore, chamfer angle 82 degree, use as a drill stop to get the depth you want. They clean the hole and make the chamfered hole in one step.