This is a Heavy Duty Control Horn System for large and giant scale models. FEATURES: Black nylon plastic. Aluminum pins and nuts. Adjustable length and height INCLUDES: Two 8-32 socket head cap screw Two large nylon washers Two aluminum pins Two small cotter pins Two threaded and tapered nuts Two nylon arms Two clevises (swivel clevis style) for 4-40 rods REQUIRES: Mounting and drilling of a 5/32" hole SPECS: Clevis Length: 30mm (1.18") Width: 9.7mm (0.38") Height: 9.16mm (0.36") jmm 11/16/02 ir/jxs