1G8: nickel plated 12.2mm wide spring-clip style, no tool chain connector for 1/8" pitch 1G8 BMX/Grind chains . #11 (Star): nickel plated 9.2mm wide spring-clip style, no tool chain connector for 1/8" star series 1-speed chains . 1R8 (Racing): nickel plated 9.2mm wide spring-clip style, no tool chain connector for 1/8" 1R8 1-speed chains. IntraX: nickel plated 7.8mm wide snap-on style for 3/32" IntraX chains. 6-8 speed: stainless steel 6.8mm wide no tool chain connector for 3/32" Wipperman chains. 9-speed: stainless steel 6.5mm wide no tool chain connector for 11/128" Wipperman chains . 10-speed: stainless steel 6.1mm wide no tool chain connector for Shimano, and newer Campagnolo compatible 11/128" chains.