Connection type: round handle, hexagon handle, quick joint handle, internal thread type (M10, M12, M14, M16, 3/8”, 5/8”-11, 1/2G etc.) and external thread type(1/2G” etc.), punching core drill, slotting core drill sleeve core drill etc.. Round handle, hexagon handle, quick joint handle core drills belong to low speed core drill, best matches 2000-3000rpm electric hand drill or benching drill. Thread type core drill belongs to high speed drill, best matches 10000-13000rpm angle grinder. The wall thickness of hexagon handle and quick joint handle core drill is usually 1.2-1.5mm, drilling over 30 holes. The wall thickness of internal thread and external thread type core drills is 1.5-2mm (common 1.6mm), drill over 30 holes (below 14mm) and 50 holes (over 14mm).

The commonly used specifications are D45/50 and D50/70, which are mainly used for the lower water inlet of the processing tank. It can also process any countersunk hole of the stone. Special specifications can be customized.