The roundover design allows for easy entry into the miter slot, while the expansion collars ensure zero clearance between the miter bar and track, preventing any wiggling for enhanced accuracy Crafted from premium aluminum alloy, these miter bars offer exceptional durability, ensuring long-lasting performance for your woodworking projects The miter bars, with their standard 3/4"x 3/8" dimensions, these aluminum crosscut sled runners easily install and securely fit into both T-shaped and U-slot miter tracks Whether you're building sleds, spline jig, tenon jig, table saw turning jig, coping sleds, box joint jig Contents included: (2 )Miter Bars, (12) #8 wood screws (3/4" long), (8) 1/4"-20 UNC countersunk machine screws, (1) 2.5mm Allen key wrench, (1)instruction manual, Manufacturer: O'SKOOL