Profile: Cotterman Co. specializes in the manufacture of ladders. We are associated with rolling ladders. We also have fixed, track and office ladders, Maxi lift platforms, which has powder coated steel, Haldex-Barnes hydraulics, Trojan DC batteries, Guest 10 AMP battery charger and Colson phenolic casters and Work master platforms. We also have self closing platforms, which can can be mounted to round rail, square rail, angular rail of up to 2" or a firm reinforced wall surface and made of stainless steel spring that closes the gate after each pass thru. We offer replacement parts involving 4" Swivel Caster A-301-0588, 4" Rigid Caster SU1070 and 2" Universal Caster Box SU2539.