Cup Square Hex also known as carriage bolts or coach bolts. Generally used for connecting timbers together. The unique square under the domed head prevents the bolt from twisting once nut has been tightened.
Comes complete with Nuts & Washers.
Available in the below lengths;
50mm - 6 per pack
75mm - 6 per pack
100mm - 4 per pack
130mm - 4 per pack