The PEAK Lap Extension was designed with an eye to strength and functionality and fabricated from stainless steel and aircraft grade aluminum. It allows maximum flexibility in positioning your vise resulting in maximum comfort and tying enjoyment. Use it to raise or lower your vise and position the vise optimally from your tying bench. Compatible with vises using a 3/8" riser shaft. You can also mount accessories such as PEAK&';s Waste Catcher, LED Tying Light, Tool Post Caddy or other accessories intended to mount on a 3/8" diameter shaft.