Features:Made of premium aluminum alloy material, high strength, durable in use.Ideal for shop built tables for routers, band saws, drill presses and more.The T-bar slides smoothly into the miter track or miter T slot on your table saw, band saw or shaperUse the T-bar to build all types of jigs, fixtures or sliding sleds for your shop.Solid, durable extruded anodized aluminum maximizes T-track efficacy, machining and accuracy.Specification:Material: Aluminum alloyTreatment: surface anodizingModel: 300mm/11.8in, 400mm/15.7in, 500mm/19.7in (Optional)Fixed hole number: 300mm: 2pcs400mm: 3pcs500mm: 3pcsFixed hole spacing (mm):300mm:220500mm:160600mm:210Number of screws: 300mm: 3pcs400mm: 4pcs 500mm: 4pcsPackage List:1 x Slide Slab with Stainless Steel ScrewsNote: Cooperate with T screw special slot (M6 or M8 special T screw) does not contain, need to buy separately..