Rockwood OH1003M Standard Duty Surface Mounted Overhead Stop, Satin Stainless Steel The standard duty, stainless steel OH1000 Series Surface Mounted Overhead Stop & Holder is designed specifically for single-acting doors and is an ideal choice for situations with medium traffic and medium-weight doors. This product features a heavy shock absorber spring that offers compression before the deadstop, and its stop function is UL listed for use in fire door assemblies for a reliable and safety-conscious option in various applications. For single acting doors Slide track design Recommended for medium traffic, medium-weight doors Degree of opening fully adjustable and can be adapted to changing needs Heavy shock absorber spring provides compression before deadstop Durable slider cam and shock block Stop function UL listed for fire door assemblies 110° maximum opening 3/4" square channel Multi-function unit is shipped as a stop Fastener: Jamb: #12 x 1-1/2" FH WS or #12-24 x 1/2" FH MS Door: #12-24 x 1-1/2" FH MS and 5/16" dia. sex bolt