Billet aluminum drive gears that use the 3/8 pitch L series "Gilmer" 1.000" wide, square tooth belts. Available for all 1.000" drive mandrels with 1/8 keyway. The gears feature a .150" radius on one side of the I.D. This enables you to run the gear flush against the mandrel if you chose to do so. The gears are hard coated for long life.