Alpen Widia Long life drill bit (Blister 1 Pieces). -Diameter: 18.0mm. -Hard metal drill bits with Widia alloy (Tungsten Carbide), providing great hardness and durability. -Indicated for percussion drilling and drilling of walls and natural stone. -High drilling speed thanks to the aggressive sharpening of the tip. -Great resistance and stability due to its precision milled slots. -Suitable for concrete, natural stone and brick.