Biesemeyer 78-431 T-Square Anti-Kickback Snap-In Spreader For Delta Left Tilt Unisaw Table Saw Designed to reduce dangerous kickbacks, this spreader snaps on instantly and removes easily from Delta and other table saws. T-Squares, anti-kickback spreaders Always in alignment with blade for safe, trouble-free operation Easily removed and replaced when performing non-through cuts Measures 4.2 by 4.8 by 12.2 inches; weighs two pounds