10-Pack Bearings R188-2RS 1/4" x 1/2" x 3/16"inch - Miniature - Sealed square flange type Size: 50 x 110 x

Size: 50 x 110 x 40 mm

Static load rating Cor: 70

they are all compatible

R166-2rs Ball bearings

it's perfect for gearboxes

10-Pack Bearings R188-2RS 1/4" x 1/2" x 3/16"inch - Miniature - Sealed square flange type Size: 50 x 110 xR188 2RS Sealed Ball Bearings 10 Pack 1 4" x 1 2" x 3 16" Chrome Steel Greased & Ready This 10 pack of R188 2RS deep groove ball bearings is built for smooth, reliable rotation in compact devices. Made from high strength chrome steel and sealed with rubber on both sides, theyre perfect for applications like yo yos, fidget spinners, and small electric tools. Pack size: 10 bearings Inner diameter: 1 4 inch (0. 25") Outer diameter: 1 2 inch (0. 50")