Chromium plated domed head bolt with flats beneath (supplied with washer and nut). Choice of round head 14.5mm head diameter x 26mm long x 5/16" (approx 8mm) thread OR flat head 15.7mm head diameter x 20mm long x 5/16" (approx 8mm ) thread. | Dimensions: 14.5mm; 26mm; 5/16"; 8mm; 15.7mm; 20mm | Supplier part no: 481