35460 Type 221-P Heavy-Duty Parabolic Flute Taper Length Black Oxide Tang Drive 135Â degree Split Point Drill Bits (6 pack) 1-3/4" 2ND REDUCTION Helical 10:1 gear

2ND REDUCTION Helical 10:1 gear set fits gearbox sizes SK1SI40/50/63

Boston Gear’s internal gears are spur gears turned "inside out

Installs on any air tool with a threaded exhaust port

it is recommended that rigid fitting be installed at the working end

35460 Type 221-P Heavy-Duty Parabolic Flute Taper Length Black Oxide Tang Drive 135Â degree Split Point Drill Bits (6 pack) 1-3/4" 2ND REDUCTION Helical 10:1 gearParabolic flute drills are designed to eliminate the need for frequent drill retraction when deep hole drilling in low to medium tensile strength materials. The split point and heavy duty design provide superior performance by permitting higher feed rates and continuous drilling of deep holes. Click Here for product catalog Proudly Manufactured in the U. S. A