RYOBI Powerglide Size 4 Overhead Door Closer 1554The Powerglide 1554 Door Closer from Ryobi has a fixed strength size of 4 and it is suitable for both timber and UPVC doors as well as insulated fire doors. It is designed for use in areas not subjected to changes in air pressure with doors up to 1100mm in width and 80Kg weight. With adjustable closing speed and latching action, the Powerglide 1554 is suitable for standard, parallel arm and over door installation. Designed for use in areas not