... . 4", 4.5", 5",7". 4.Original Manufacturer Flap discs and wheels grind and finish in one step, thereby, ... time and finishing costs. Zirconia flap disc for use on steel. Aluminum turbo flap disc disc for use on ... 1. T27,T29 Abrasive Flap Discs2. Backing: plastic cover, color: red3. Material:sintered material4. Color: Blue5. flap discs are made of ... , T297"7/8"P600-P12008600T27,T29 Zirconia Flap Discs