Atoplee 20pcs 4 * 13 * 7mm Metal Sealed Guide Wire Line Track 4 X 13 X 7mm Deep U Groove Pulley Rail Ball Bearing U624ZZ4;

Features:

100% brand new and high quality
U groove Sealed Ball Bearings
This item is ordinary precision, adaptation to low speed, low load applications
Package Included:

20pcs U groove Sealed Ball Bearings