Permits doors to open in either direction and automatically return to closed position. Provides maximum protection for doors subject to normal abuse of lift trucks, due to resiliency of spring support and shock absorbing reaction of flexible mounting. Adjustable spring tension permits power and speed adjustment of each size spring hinge. Door flange is mortised into edge of door. Jamb flange is surface applied to jamb. Steel material, non-template, non-handed. All wood screws. Do Not Use On Doors With Hinge Edge Beveled.