CMT 661.021.41 Roundover Bits w/Insert Knives 57/64" x 49/64" (R=5/64") S=1/4" Black powder coat What is the G90 galvanized

What is the G90 galvanized coating on the HD7B and why does it matter

550 is a 55mm Forstner Bit for drilling precise flat-bottom holes in softwood

remodelers

Cast-in-place or wet set into concrete

Install With: Install with 5/8 in

CMT 661.021.41 Roundover Bits w/Insert Knives 57/64" x 49/64" (R=5/64") S=1/4" Black powder coat What is the G90 galvanizedThe CMT 661. 021. 41 is a 57 64 inch roundover router bit with two replaceable insert knives (R=5 64 inch) and 1 4 inch shank. Features a 4 sided knife insert that can be rotated for 4 usable cutting edges. For rounding over edges on hardwood, softwood, laminates, and chipboard. Bearing guide for accurate edge following. SPECIFICATIONS Order Number 661. 021. 41 Cutting Diameter 57 64" Radius (R) 5 64" Cutting Length (I) 49 64" Shank Diameter 1 4"