104BCD and 4 Arms: It fit for MTB frame. 104mm BCD is a popular crankset. It with spindle offers higher rigidness when riding. Length we offer 170mm and 175mm. Multi Speed Support: the crankset can use as 1x, or 2x and 3x speed. Use as 1x speed is more popular. It comes with 1 unit 104bcd narrow wide chainring in package, works for 7-12s chain. Crankset hole for pedal is 9/16 inch(14mm). Thread BSA Bottom bracket included. Aluminum side cap inside. Crankset spindle diameter is 24mm, it is same for Shimano size. Forged Aluminum and CNC process: it is 3D forged and CNC processing. Material Aluminum 6061. Hollow tech applied to make it lightweight. A pair crankset weight 680g only. Package Content: a pair crankset, 1pcs 104BCD narrow wide chainring, 4 sets steel bolts, 1pcs BSA bottom bracket, aluminum side cap, wrench for side cap. ASIN B0B38SDHF1 Size Round 34T Color 170mm Black Brand Name DJC Components Item Weight 1.13 Kilograms Part Number JK104uni Manufacturer SZJK Package Weight 1.13 Kilograms Warranty Description 1 year Item Dimensions LxWxH 9.84 x 5.91 x 5.91 inches Item Package Dimensions L x W x H 9.41 x 6.42 x 5.2 inches