Square Bolt (C Bolt) M10 x 30 mm Thread, 81 x 70 mm Internal Dimensions - Galvanised Mild Steel Complete with 1 full nut and 1 half nut on each leg Ideal for fastening two off 4040 RHS (Rectangular hollow Section) in landscape orientation, but of course will have many uses Please refer to diagram for details (all measurements in mm): RHS : 4040 A = 10 mm B = 81 mm C = 70 mm D = 30 mm Centers = 91 mm Material Finish Galvanised Mild Steel - A duller finish than BZP, typically 50 microns thick covering of Zinc and therefore provides much more protection suitable for many out door applications. If using your own nuts on galvanised products please ensure they are tapped oversize to allow for the galvanised layer Tolerance on dimensions +/- 1 mm. Please note that as we use roll threading, the bar diameter is slightly less than the thread diameter