Alpen Widia Professional Beton Drill Bit Case 5 Pieces. -Hard metal drill bit with Widia alloy (Tungsten Carbide) providing extreme hardness and durability. -High-performance drill bit for application in impact drills and rotary hammers with holder for drill chuck. -Hammer resistance, thanks to the innovative vacuum hardening. -Robust thanks to the highly resistant tip. -Accurate due to their excellent centering properties. -Indicated for percussion drilling in concrete, walls and natural stone, as well as ceramics and marble. -Includes:- > 1 4 mm professional beton widia drill bit. diameter.->1 5 mm professional beton widia drill bit. diameter.->1 6 mm professional beton widia drill bit. diameter.->1 Widia professional beton drill bit, 8 mm diameter.->1 10 mm professional beton widia drill bit. diameter.