heat treated 4130 tubular crank arms, 3/4" heat treated 48 splined spindle, both left and right hand drive compatible, sealed cartridge bearings with anodized aluminum cups and cone washers, grade- 8 flush mount hardware and tool included, available with european or american bottom brackets, durable powdercoat finish, weight: 2.5 lbs american. (2.2 lbs. euro.) 175mm.