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bi metal hole saw
electric hammer drill
Hollow electric hammer drill is composed of guided drill and connecting rod. It can be fitted to various electric hammers as boring tool for processing large hole. There are BI metal hole saw and wall hole saw. the BI hole saw coats from 19mm to 114mm , wall hole saw from 30mmto 120mm .
Small adaptorA2 IS 0.46mm, big A4 is 0.73mm
SDS adaptor is from 110mm to 400mm. MAX adaptor is from 160mm to 400mm.
the material is 40CR , tip is YG8C. and we have hole saw for glass,