TeeChina Um Type Clamping Er11 Er16 Er20 Er25 Er32 Er40 and Er50 Clamping Nut with High Precision, Find details about China Um Clamping Nut, Clamping Er Collet Nut from Um Type Clamping Er11 Er16 Er20 Er25 Er32 Er40 and Er50 Clamping Nut with High Precision