Material: made of high speed steel and super hard titanium coated bits. Durable and anti-rust.
Size: 6mm(1/4''), 8mm(5/16''), 9mm(3/8''), 12mm(1/2''), 16mm(5/8''), 19mm(3/4'').
A chatter-free and five-flute design insures free chip flow and rapid chatter free cutting.
1/4? hex shank countersinks are suitable more drills, clamping not easy to slip.
Suitable for wooden planks, fiberboard, particle board, plywood, plastic, aluminum board ,etc. Perfect for DIY, home and general building or engineering using.