... screw support 1.Size:05mm-40mm 2.Series:BK,FK,AK,EK,BF,AF,FF,EF and so on 3 ... Feature:Bearing:Ball screw support1.Size:05mm-40mm2.Series:BK,FK,AK,EK,BF,AF,FF,EF and so on3. Stocking ... wholesal4.Promt deliver and servince-----------------------------------------------------------------------------------------------------------------Brand NameTXPModelBK,BF,EK,EF,FK(WBK),FF(WBF),BFU,BKU,EKU,EFU BKEU,EKEU, ...