1.5 Inch Sliding Nylon Wheel Groove "u" With 2pcs 608zz Bearing Bore 8mm Or 6mm - Door Rollers - AliExpress
6/8x42x24mm nylon U type pulley wheel white color 608zz double bearing rolling pulley wheel for Spinning machine 15mm track rial|Door Rollers| - AliExpress
BW25 8mm W V groove bearing 608ZZ 608Z 608 Openbuilds for 3D printer nylon wheel ball bearing with pulley 20 type track roller|Window Rollers| - AliExpress