Applicable:Threaded BB central axis,ISCG03/ ISCG05 general,32T-38T Chainring. Good compatibility, ISCG03, ISCG05, BB lock adapter installation. Premium material: the chain guide adopts high-strength aluminium alloy with CNC machined and heavy-duty nylon, lightweight, not easy to rust or break, wear-resistant and resistant to deformation, strong and durable.