laser welded core drill bit diameter:1",1-3/8" ,2",3",5"working lenth: 150mm long cutting life very sharp, fast speed laser welded core drill bitdiameter:1",1-3/8" ,2",3",5"working lenth: 150mmlong cutting lifeAdapt: SDS LONG 1PC, SDS SHORT 1PCS, DRILL: 10X200MM 1PCS, SHIFT KEY, 1 PCAluminium case 1 setvery sharp, fast speed