inner diameter: 36mm----205mm. no-cut inside, 8-class accuracy. alloy: 6201,6005,6061,6063 heat dissipation. 1. ... , PVDF, and powder coating5.Specification : as per customers' requirement6.Inward no cutting7.Highly effectient energy emission8.ID: 36----205mm aluminium round ... motor shell, made of aluminium alloy, powder coated, T5, no-cut inside