SMR137ZZ ABEC-5 Ceramic SI3N4 Stainless Steel Ball Bearing Bore Dia. 7mm Outside 13mm Width 4mmSMR137ZZ ABEC 5 Ceramic SI3N4 Stainless Steel Deep groove ball bearing single row Radial Bearing 7 mm ID x 13 mm OD x 4 mm Wide. Brand : VXB Item Sku : SMR137 ZZ Ceramic Type : Deep groove ball bearing single row Material : Stainless Steel Balls: Ceramic Si3N4 Quality: ABEC 5 Inner (ID) : 7mm Outer (OD) : 13mm Width : 4mm Inner Inch : 0. 276 Inch Outer Inch : 0. 512 Inch Width Inch : 0. 157 Inch Size : 7mm x 13mm x 4mm Size Inch : 0. 276" x 0. 512" x