80-Pack 608B-2RS Skateboard/Inline Skate/Rollerblade/Hockey/Fidget Spinner Black Bearings Bronze Cage Outer Diameter - 29mm It features a set screw

It features a set screw style clamp and a 1-1/8 inch bore for common shaft sizes

6005ZZENR Nachi Bearing

the NKI15/20 inner diameter is 15mm

Size: 50mm x 80mm x 16mm

80-Pack 608B-2RS Skateboard/Inline Skate/Rollerblade/Hockey/Fidget Spinner Black Bearings Bronze Cage Outer Diameter - 29mm It features a set screw10 Sets=80 Skateboard Inline Skate Black Bearings work with Roller Hockey Rollerblades Too Bronze Cage 10 Sets Skateboard Inline Skate Black Bearings ,each set has 8 bearings in a retail box, bearings Work in RollerBlades and even Scooters 80 Deep Groove Radial Ball Bearings, bearings are blacked and have Bronze Cage that would make them faster, bearings have 2 Removable Black Seals, Made from high strength chrome steel for durability and performance,