ES Robbins 128173 45x53 Lip Chair Mat, Multi-Task Series AnchorBar for Carpet up to 3/8" Sold as 1 EA. For use with low pile carpet such as loop/berber style up to 3/8" thick including padding. For moderate office use. Exclusive AnchorBar chair mat cleats hold firmly in place yet are gentle on carpet and fingers. Crystal Edge creates a smooth finished edge of superb clarity while providing effortless roll on/off mat.