... . OEM service and designed service offered 3. Material: Gcr15 Pillow block bearings:1. Material: Gcr15 Chrome steel, Stainless steel or Carbon ... ,V3,V45. Innder windage code: C0,C2,C3,C4,C56. Precision Grades: P0,P6,P5,P4,P2(ABEC1,ABEC3,ABEC5,ABEC7 ... ,bolt & nut, bucket ,teeth ,adaptor,muffler etc . High quality Pillow block bearings