Profile: DQR Precision Ltd. is a distributor of covers for the protection of linear motion products. This includes folding concertina bellow covers, roller, apron, and ball screw covers. Bellow covers are generally constructed from one piece of material, which together with the thermal bonding process provides impermeable protection against oil or emulsion. Roller covers are generally applied when space limitations exclude the use of bellow covers. VISIPORTr spin windows are available with high torque electric motors for harsh environments with constant coolant flow and chip bombardment. Our polycarbonate window panes are used in machine tools to protect operating personnel against the risk of ejected parts.