Adjustable Spring Power Size 1 (Barrier-Free) to Size 4 (Regular) Can Retrofit Existing Fixed Spring Closers Standard and Extended Spindle Models 5 Year Limited Warranty C.R. LAURENCE 20101M19 CRL Jackson Adjustable Spring Power Multi Size 90 No Hold Open Overhead Concealed Closer Body. This CRL Jacksonr Adjustable Spring Power Overhead Concealed Closer Body, which depending on the selected spring size and closer function, is suitable for a range of doors from 30" to 42" (762 to 1067 mm) wide. The closer features dual action valves for closing operation (one valve for closing, one valve for latching). 90 and 105 Degree Hold Open and Non Hold-Open models are available. Closers fit into standard 1-3/4" x 4" (45 x 102 mm) or larger header extrusions. Interchangeable with all Jacksonr and similar style of Overhead Concealed Closers..