The Multi-Step Attachment, Hip Thrust/Split Squat Roller, and Dip Bars connect to The SledTred via our unique and patent-pending double rail system that allows for maximum adjustability to ensure proper positioning and comfort for every user. Adjustment Levels Sledding Pad: 4 levels of height adjustment. Hip Thrusts/Split Squats Pad: 6 levels of height adjustment. Nordic Curl Ankle Pad: 3 levels of height adjustment. Multi-Step Attachment: 17 levels of height adjustment with 1.5" of height adjustment per level.