ES Robbins - 45x53 Lip Chair Mat, Multi-Task Series AnchorBar for Carpet up to 3/8" 128173 (DMi EA For use with loop/berber style carpet up to 3/8" thick including the 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. Protect your carpet and stay on task with an ultra clear mat that allows you to roll freely within your workspace.