No point in wasting money or space. Get an ab/back machine like the Body Solid CAM Series. This unique dual-function machine allows you to exercise two major muscle groups (abs and back) for one great low price. The innovative plate-load design is based on health club single station machines. We even incorporated 2" x 4" mainframe steel from our commercial grade line of equipment for institutional quality. The full-range cam design has an easy-to-use pop pin that allows an additional 26 adjustments to increase and control your range-of-motion. Break-through technology lets you tighten abdominal muscles, strengthen your lower back and increase flexibility. Weight plate post is 1"" dia. Shown with optional #OAS14 - Olympic Adapter Sleeve. Olympic Adapter Sleeve, weight plates and collar optional. Specifications Ultra-thick DuraFirm