604ZZ Outer Ring With U groove Stainless Bearings 4*12*4 mm ( 2 PCS ) Miniature Fishing Rod Reel Pulley U Groove Wheel Bearings

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MR52ZZ Bearing ABEC-7 (10PCS) 2*5*2.5 mm Miniature MR52 ZZ Ball Bearings L-520ZZ W52 MR52Z - AliExpress

Bearing 604ZZ- U Groove - Stelltron

4mm Bore Bearing with 12mm Pulley U Groove Track Roller Bearing 4x12x4mm – VXB Ball Bearings

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U604/12 604UU 604 U604 U groove deep groove ball bearing 4x12x4mm Walking guide rail bearings - AliExpress

Miniature High Carbon Steel Bearing Ball Bearing 608ZZ 623ZZ 626ZZ 687ZZ 607zz Deep Groove Bearing Skateboard Scooter 3D Printer - AliExpress

U Groove Pulley Bearing

Taper Roller Bearing-, Linear Rail Guide, Thrust Ball Bearing from China Manufacturer.

SWMAKER 10pcs 4*12*4mm bearing wheel, U groove, 604UU pulley roller, 604zz steel wire wheel, lifting wheel, very mute - AliExpress

U-groove traces pulley bearing.Apply to:All kinds of fitness equipment,Telecommunications equipment,Instrumentation,computer,precision

20pcs U Deep Groove Pulley Bearing Rail Ball Bearings Mini Pulleys Wheel, U624ZZ 4x13x7mm

Sheave Rollers 304 Stainless Steel Gliding U Rollers - Temu