The Altus FC-M311 crankset for square bottom brackets features a rigid 2-piece construction and Hyperdrive SG-X chainrings. The pre-installed chain guard (optional selectable) keeps your legs and pants clean. The crankset is Dual SIS compatible. Features Chainring BCD: Riveted Hyperdrive SG-X chainrings Spindle Interface Type: Square Taper JIS BB Included: No Chain Compatibility: 3/32" Crank-FD Type: Mountain Triple Specification Recommended use: Road Chainring format: Triple Type: Square taper/spline Length: 170, 175mm Material: Aluminum, Steel Compatibility: 7, 8 Speed Additional Info Country of Origin: Malaysia/Japan Imported By: Shimano South Asia Pvt Ltd. , 19 , (Ground Floor) Kumara Krupa Road , Bangalore – 560 001 , Karnataka , India. Net Quantity: 1N Customer Care Address: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com Commodity: Cranksets