ISC 4-20mm Professional Titanium Step Drill 1 Pc HSS Triangle Shank 1Pc
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Specifications: Material:HSS-Co Surface treatment: TiALN coated Handle diameter:1/4" Hex shaft Step quantity:9 steps Step diameter: 4/6/8/10/12/14/16/18/20mm Note: Please water it for cooling while punching so that can prolong its lifetime, rotation rate from 550 to 2800(rad/min) is recommended. Package Includes: 1 X 4-20mm Hex Coated Core Step Drill Bit
