Big Roc 57SCRFIA48A2 Cotterless Crank Set ((Red),1/8"X48T,Cnc Roundx170 mm) 1/8" x 48T, w/CNC round x 170mm Alloy crank Blue polish Anodized Crank & chain ring w/lasco logo w/2Pcs M8 cap less Bolts Cotter less, alloy Orange