48" T-Track PLUS 2 Hex Bolts/Knobs Specialty "T" track allows you to slide a 1/4"-20 hex head bolts to mount, position or hang fixtures Ideal for hold-downs on table saws - it requires a 23/32 under size plywood straight bit Standard hex head bolt that slides into the track & soft to the touch star knob for adjustments T-Track is Punched 3" on center & Measures: .730" (W) x 48" (L) x .490" (H) 6063 Ultra-Corrosive Resistant Architectural Grade Alloy, T5 Temper