Available for stone, concrete and asphalt drilling. Length available : 50mm and 100mm Available for stone, concrete and asphalt drilling.Length available : 50mm and 100mmThe range of this item:Dia30mm G1/2" connector, drill bits;Dia40mm G1/2" connector, drill bits;Dia50mm G1/2" connector, drill bits;Dia75mm G1/2" connector, drill bits;Dia100mm G1/2" connector, drill bits;G1/2" connector, drill ...