Bore Size:3 - 15 mm Outside Diameter:7 - 32 mm Precision Rating:ABEC7 P4 Seals Type:double seal 2RZ Number of Row:Single Row Size:15x32x9 mm Material:chrome steel ring SI3N4 ball Ball:Ceramic Si3N4 ball Brand:YWS brand Precision:ABEC7 P4 grade Seal:double seal 2RZ rubber material one bule one red Speed:60000r/min Useage:CNC router engraving machine / spindle / differential pinion shaft Installation:red outside blue inside Show More