Nexen Profile Guide Rail Brakes, Generation II provide engagement at 0.049 to 0.230 seconds, higher static holding force to 3,400 N (764 lbs.) and can be combined to provide higher holding forces as needed. They offer maintenance-free operation and are fully compatible with all 16 major rail manufacturers including Lintec NB PMI Rockford and SBC Rail. The guide rail brakes come in sizes 15 mm to 65 mm.