Our package includes:1pcs prowheel crankset, 1pcs chainring，2 accessories.Chainring size 1/8 52T*170mm.Packed in hard boxes, the products will arrive in good condition.prowheel crankset 170mm Durable for long lasting use:The bike crankset is made of Steel，prowheel crank arm - aluminum alloy，Plastic Double Wall Chain Cover，makes it durable for long lasting use.Suitable for mountain bikes, commuter bikes,E-bikes,etc. Speed:The 52t crankset 170mm is suitable for single/1/6/7/8 speeds bikes.For example：Fat bike/E bike/City bike/Folding bike. Plastic Double Wall Chain Cover: protect the chain, Prevent shifting caused by sprocket，Not easy to fall off the chain. Crankset 52t:Weight about 850g/1.87lbs. ⭐We have remeasured that the arm is 170mm（correct measurement method）.The products we send out are all brand new. Prowheel Crankset 52T Prowheel Crankset 170mm Universal Square Crankset Set Double Chain Cover 170MM Crank Arm Aluminium Alloy Arm for Single/1/6/7/8 Speeds City Bike,Fat Bike,E-Bike,Folding Bike