Divine Brothers SFX4X12 Drive Flange for Cutmaster Buffs, 4-Inch Diameter x 1/2-Inch Arbor Hole 4" diameter drive flanges used on buffs with 3" center plates 1/2" arbor hole Quantity 2 drive flanges, sold individually, are required for a Cutmaster Buff with a 3" center plate Must be used on all bias buff wheels Provides the stability and drive needed to lock down the buff face to the buffing arbor/shaft