Single speed 1/10 scale metal clutch bell. May also suit some 1/8 scale models/ 23 Teeth. Uses (not included) 10mm x 5mm x 4mm bearings. Outer diameter 28mm. Inner diameter 26mm (where clutch spins). 23mm long. Clutch shoes not included. Note: Cog turns clockwise to tighten. Images copyrighted by BlackSmith Products Ltd.