uxcell Repair Parts 20mm Inner Diameter Ball Bearing Retainer for Bike Product Name : Ball Bearing Retainer;Ball Number : 9;Inner Diameter : 20mm / 0.79" Outter Diameter : 30mm/ 1.2";Material : Material Metal : Metal;Color : Color Silver Tone : Silver Tone;Weight : 8g Package Content : Package Content;1x Ball Bearing Retainer : 1x Ball Bearing Retainer