Rig mats, another variety of access mats, may also known as wood and steel mats or steel frame mats. These mats are commonly made of spruce, pine, fir or a combination thereof encased in a steel frame. The frame is normally I Beam or HST steel. The average life of our drilling rig mats is approximately 10 years, though some have remained active for 15 – 20 years. Rig mats are made with 6 x 15 , 8 x 20, 8 x 30, 8 x 40. Custom Sizes Available