... : 4" or 5" 1. Polished Alunium House 2.Angle head, Roll type 3.Free speed: 11000 rpm 4.Front exhaust. Pneumatic Grinder ... grinding,edgbreaking,deburring.Specification:1) 4",5" air angle grinder (roll type) 2) Free speed: 11,000rpm3)Air inlet: 1/4" BSP ...