1 1/4 diameter rods, CCA treatment for longevity. 1/4" steel shear plates between each timber makes this mat very strong. $ 2,175.00. Timber Pad 8" x 48" x 96" with steel plates quantity. Add to cart. Timber Pad 12″ x 72″ x 144″ with steel plates. ×. Timber Pad 12" x 72" x 144" with steel plates. 12".