These countersinks are designed to drill the pilot hole and countersink or counter-bore for screws in one step. This allows you to countersink to drive the head of the screw flush with or slightly ...

It includes 5 sizes in one counterbore set(m3, m4, m5, m6, m8). Size：Boot x Blade Diameter x Shank Diameter x Full Length: M3=3.2 x 5.9 x 6 x 45mm, M4=4.2 x 7.4 x 6 x 48mm ,M5=5.2 x 8.9 x 6 x ...