Single speed bicycle freewheel, model SC-FR-101, made with 16T, 18T, 20T, 22T or 24T teeth. A freewheel threads onto the rear hub, drives the wheel while pedalling and lets it turn freely when the pedals stop. Tapping is 1/2" x 1/8" x 24 TPI/1 mm, and it is available with half or full balls. Finish options are Black, BLP or Golden, to order. This model has a dark grey toothed sprocket ring around a bright silver body, with two small holes on its face.