5mm thread with sleeve to suit 12mm glass hole, 4mm-8mm thick of glass Offset holes through nuts and washers to allow for height adjustment Total Length: Approx. 37mm (sleeve not included) Wheel Size (Dia. x T): Approx. 25 x 5.5 mm Replacement shower door roller to fasten roller to mount. This shower door roller will provide smooth sliding. White ABS material shower door roller with stainless steel shaft. Description: Material: ABS wheel with stainless steel shaft Color: White, grey Package included: 4 x Shower Door Roller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.