17-Piece Universal T-Track Kit: Outfit your workbenches, jigs, or machine tables with the ultimate aluminum T track accessories for woodworking kit! This aluminum T slot kit includes 4ft of aluminum T tracks, bolts, and knobs. Unique Stacked-Slot Design: Universal 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. Flexible Uses: The Rockler T track aluminum extrusion has flexible uses in the shop when making jigs and fixtures used on woodworking and metalworking machines, configure blue t track components in almost every direction. Easy To Install: Our blue T track is easy to install. Mounting screws are not included with any of the tracks. For added versatility and functionality, combine T-Tracks with 5-1/2"L x 1-1/8"W Hold Down Clamps (#35283), and 3-1/2"L x 3/4"W Hold Down Clamps (#45692). What’s Included? This Rockler T track kit includes (1) 4' length of Universal T-Track, (2) 3-1/2" x 5/16" T-bolts, (2) 1" x 5/16" T-bolts, (2) 1-1/2" x 5/16" T-bolts, (2) 2-1/2" x 5/16" T-bolts, (4) T-track knobs, (4) 5-star knobs. Rockler 17-Piece Universal T Track Fence Kit with T Track Guide: The Universal T Track system boasts a unique stacked-slot design that allows you to attach any accessory with 1/4" T-track bolts, 5/16" T-bolts, or 1/4" Hex-bolts. Rockler T track hardware kit has additional lengths of track are sold separately. For added versatility and functionality, combine T-Tracks with 5-1/2"L x 1-1/8"W Hold Down Clamps (#35283), and 3-1/2"L x 3/4"W Hold Down Clamps (#45692). All jig tracks are made of aluminum for strength and durability. Universal T-Track and Miter Track are blue; T-Loc and Dual Track are silver. The Universal 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 2’ Rockler track has six holes; the 3’ track has nine holes, and the 4’ track has twelve holes.