Quick view Add to Cart Koswork 16T Mod1 Lightweight Hardened Steel Pinion w/5mm Bore KOS03006-16 $20.95 inc GST Koswork 16T Mod1 Lightweight Hardened Steel Pinion w/5mm Bore Key Features: Hardened steel material Lightened for best acceleration For 5mm bore motor Large 5mm set screw grips better Precisely CNC machined, lightened & hardened Compare