Another thickness up is 17mm thick is ideal for recesses that happen to be 14mm, 15mm, 16mm and 17mm deep. 24mm thick will work for recesses which are 21mm, 22 and 23mm thick as well as the 30mm will operate for recesses that happen to be 27mm, 28, 29mm and 30mm thick.Like seven hundred and 900 gram soil stabilization mats, EC-4Y 400 gram coir mat