Includes 2 Clamps per kit. The Bison End Stops are a great solution to simply clamp on stops for your monorail or bridge to prevent a hoist or trolley from traveling further than the clamping point. Fits W-Beams. Includes full assembly (nuts, bolts, buffer blocks, threaded rods, and brackets). The adjustable buffer blocks allow for compatibility of a wide range of hoist and trolley brands. The adjustable flange width accommodates for a variety of beam profiles.