Woodhaven 4553 Box Joint Jig Upgrade Kit The Box Joint Jig Upgrade Kit adds additional safety, convenience and ease of use features to your 4555 Box Joint Jig - sold separately. The 4553 Upgrade Kit can be added at any time once you have the 4555 Box Joint Jig. You must have the 4555 Box Joint Jig to use the 4553 Upgrade Kit. Includes our 4555D five piece Setup Jigs for quick and easy setups of 1/4, 3/8, 1/2, 5/8 & 3/4 joints. Includes two adjustable Work Platforms that provide a safe and stable surface for the part to rest on. Made of slick 1/4" thick HDPE (color may be black or white), they attach to the underside of the 24" Ultra Track from the 4555 and eliminate friction between your saw or router table and the bottom of your workpiece. Also includes an Adapter Head for attachment to your miter gauge so you dont have to make your own. Includes a Stop that attaches to the back of the 24" Ultra Track. This indexes against a side of the Adapter Head to help fine tune the joint size. Also includes a bit/blade Shield that attaches to the top of the 24" Ultra Track and projects out the back where the bit/blade exits. Lifetime guarantee against defects in material or workmanship. Made in the USA!