Feature: * Easy to install: chain joints for the magic buckle, easy to disassemble, easy to clean, reusable * Strong Rally: Special forging steel, repeated forging, strict control of materials to ensure the strength * Smooth lubrication: surface polishing, internal oiling * Durable: rust and corrosion Specification： * 6/7/8 Speed： - Specification:1/2” ×3/32” 116 knots - Color:silver-plate - The classification of speed:6/7/8/18/21 speed - Axial length:about 7.2mm - Magic buckle:pressed in connector * 9 Speed： - Specification:1/2” ×11/128” 116 knots - Color:silver-plate - The classification of speed:9/27 speed - Axial length:about 6.6mm - Magic buckle:Standard pair * 10 Speed： - Specification:1/2” ×11/128” 116 knots - Color:silver-plate - The classification of speed:10/20/30 speed - Axial length:about 6.1mm - Magic buckle:Standard pair Package includes： 1Pcs 6/7/8 speed chain or 1Pcs 9 speed chain or 1Pcs 10 speed chain