... 2,popular on us market 3,strong manufacturing capability inch ball bearing 1633Features:1),Shield / closure: Open,Teflon Sealed,Rubber Seals ... , C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel7),Bore Size:from 1mm to 10mm8),Outside ...