please note: The bigger three allen bolts diameter is 10mm;
Does not works with 9 hole and 6 hole sprocket, Only fit spoke wheel bicycle, 2pcs screw 12.9 Grade/W3/8-16X1" 3pcs screw 10.9Grade/W5/16-18X1";
the Adapter fits 1.25 inch rear hub of SPOKE WHEEL BIKE with a diameter of 1.21"to 1.25" (FOR SPOKE WHEEL BIKE ONLY)
Adapter is only compatible with the 415 Heavy Duty Chain.
40T Multifunctional Sprocket :Thickness:4mm; Length:16.5cm; Diameter of center hole:37mm
10.5mm bolt hole diameter of the larger 3 holes that bolt to sprocket; 80mm measurement from center of large hole to center of larger hole that bolt to sprocket;
Compatible with 415 chain ;
Package include: 1pc 1.25" adapter and 1pc 44T CNC Sprocket