Timing Pulley GT2 ( 40Teeth-6.35mm Inner Diameter)

From the shop's description

Type : 2GT-40T Tooth outside diameter : 24.96mm The step diameter : 18mm The step length : 7mm Teeth number : 40 Length : 17mm Teeth length : 7mm Pitch : 2mm Fixed mode : 2xM4 Inner bore : 6.35mm Apply to belt width : 6mm Material : Aluminum alloy