orange baked enamel finish, tail-stop with trigger-spring 1600 lb load limit Fine woodworking & delicate assembling Fixed head design Will not stain 24-inch opening Lightweight anodized aluminum Jorgensen 3524 24-Inch Aluminum Bar Clamp. My only complaint is that (as delivered) there is no way to prevent the slider from falling off the bar end when moving it out (on the steel bar clamps, there is a rivet near the bar end for just this purpose). bars that are 1-5/16" X 13/16" extruded aluminum with U-shaped channel, anodized and notched on 1" centers fixed-heads that have 1/2" cold-drawn steel screws with smoothly cut Acme threads.