These jerk blocks consist of two stacks, each consisting of 3 x 9", 1 x 7", 1 x 5" layer and a 3" top section. these jerk block can be adjust to provide bar heights at 1" intervals. They are made from C16 structural graded deal and have interlocking timbers to ensure a secure and tight stack, regardless of height. The tops are constructed from 70mm solid deal which is glued and biscuit jointed together to ensure these jerk bloks can endure severe use. each stack weighs approximately 80kg.