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 shaper Use 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 alloy Treatment: surface anodizing Model: 600mm/23.6in, 800mm/31.5in, 1000mm/39.4in, 1220mm/48in (Optional) Fixed hole number:  600mm: 4pcs;  800mm: 5pcs;  1000mm: 6pcs 1220mm: 7pcs Fixed hole spacing (mm): 600mm:173-174-173 800mm:180 1000mm:184 1220mm:190 Number of screws:  600mm: 5pcs;  800mm: 6pcs;  1000mm: 7pcs 1220mm: 8pcs Package List: 1 x Slide Slab with Stainless Steel Screws Note:  Cooperate with T screw special slot (M6 or M8 special T screw) does not contain, need to buy separately.