Universal T Track Accessories: Outfit your workbenches, jigs, or machine tables with the ultimate aluminum T track accessory. All T-tracks are 3/4" Wide x 3/8" deep & available in 3-foot lengths. User Newer & Older Style Hardware: Our T-track for woodworking features a unique "stacked" T-slot that accepts both 5/16" T-bolts & 1/4" T track bolts, and 1/4" Hex-bolts. This means you can use all the hardware and T-track workbench accessories from your old jigs in addition to the newer style hardware. Predrilled With Holes: This aluminum T track is pre-drilled with holes for #6 flat head screws, centered in the track, and equally spaced on 4” centers along the length of the track. The 3’ Rockler T track has twelve holes. Durable Construction: Our T track hardware is made of extruded aluminum for strength and durability and this universal T-Track is in blue. These aluminum T track accessories are available in two-foot, three-foot, or four-foot lengths. Easy To Install: Easy to install each aluminum track is equipped with pre-drilled mounting holes for quick and easy installation. Mounting screws are not included with the T track. Instruction pdf is available so check it for more installation details. Rockler Woodworking Universal Blue T Track: Our universal 3 ft T track for woodworking boasts a unique stacked slot design that allows you to attach any accessory with 1/4" T-bolts, 5/16" T-bolts, or 1/4" Hex-bolts. These T track accessories are available in two-foot, three-foot, or four-foot lengths. --- Heavy Duty T Track Features: All T-tracks are 3/4" Wide x 3/8" Deep - T-tracks feature pre-drilled mounting holes in base - Holes are 4" on center, 2" from each end - Made of extruded aluminum - Mounting screws not included - For added versatility and functionality, combine T-Tracks with 5-1/2"L x 1-1/8"W Hold Down Clamp and 3-1/2"L x 3/4"W T track hold down clamps. --- What’s Included? (1) 4-foot length extruded aluminum T track. --- About Us: The history of Rockler Woodworking and Hardware goes back to 1954, when Norton Rockler started the Minnesota Woodworkers Supply Company in north Minneapolis. It was a small mail-order business with a big aspiration – to become woodworkers' go-to resource for everything they need to complete their projects.