Fibre discs (Aluminum oxide) 1) Abrasive grain: Aluminum oxide (ALO) 2) Backing : fibre (thickness:0.8mm) 3) Bond: R/R 4) Grit: P24---P400 5) Dimension:Dia.100mm,115mm,125mm,150mm,180mm 6) Punching Model:1 center hole,cross center hole or star(*) center hole or according to customer's requirement. ◆can be customized according to customer's requirement Warning:ear, eye, face and body protection