Shopsmith Power Coupling kit makes the perfect connection between your Shopsmith MARK 7 or Mark V and you single purpose tools. The Shopsmith Power Coupler is made of a virtually unbreakable plastic compound for durability and longer life. 555124 Please Note: This kit does NOT include any Special Purpose Tool connector hubs. SPT Accessory Hubs (for connecting Headstock Drive Spindles & Coupler to a Bandsaw, Belt Sander, Strip Sander, Scroll Saw, Thickness Planer, etc.) must be purchased separately from Shopsmith.