D1696 Features: -Roller. -Housing height: 1.09". -Material: Steel ball bearing. -20.16" Overall thickness at the axle. -Edge type: Concave. -1.13" Steel ball bearing roller with adjustable steel housing assembly. -20.16" Overall thickness at the axle. Specifications: -Number of wheels: 1. -Housing style: B-Tab. -Housing width: 0.56". -Housing length: 1.25". Installation