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It's weldon shank that more stable clamping for stable cutting and finish of holes.
Type: Hollow Drill bit
Material: High Speed Steel
Shank:19mm
Package Including:1pc HSS Hollow Drill Bit
Specification: Cutting Depth: 35mm/55mm Overall Length: 62mm Application: Use for hole cutting and process of annular groove on various magneric drills and press ,like Alfra , Hougen , Jancy , Euroboor , BDS , Ruko Note: Please allow 1-3mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.