Pacific (AQ) Top Double & Bottom Quick Release Double Wheel Package. Pacific shower door rollers fit glass where the distance between the centre of the fixing hole and the edge of the glass is 18mm. The minimum hole size is 6mm. The truck is held in place with a screw and this is covered with a chromed plastic cover making them pleasing to the eye and easy to clean. Maximum glass thickness should be 6mm. Suitable for most shower enclosures, shower cabins and steam cabin enclosures. Pack contains 1 top wheel and 1 bottom wheel