Bow AnchorPRO allows you to fix your Bow feather boards in mitre slots or T-track with greater speed and security. It fits in 19mm x 9.5mm (3/4 x 3/8) mitre slots and 12-19mm T-track. The generous contents enable you to use it with virtually any custom made jig. The clever design allows it to lock in place with less than a single turn of the knob. This complete set features two short mitre bars that can be used independently on small fixtures, or combined on a single jig along with the single long mitre bar. Easily accommodates variations in the width of a mitre slot. Contents: 1 x 19mm Long mitre bar 2 x 19mm Short mitre bars 2 x Bow branded chain link knobs 4 x 111mm long T-bolts 4 x 57mm long T-bolts 4 x 38mm long T-bolts T-bolts: 5/16 x 18 UNC thread, head dimensions: 18.4 x 11.4mm x 2.3mm thick.