T-LOCK M CLIPS 2MM (500 PCS BAG)Description Size S For Tile Thickness 3 8mm (1 8 5 16") Size M For Tile Thickness 8 14mm (5 16 9 16") Size L For Tile Thickness 15 25mm (9 16 1") We recommend Medium (M) is the standard tile thickness size in North America Please note that Small (S) and Large (L) clips are only available in 1MM grout joints. We recommend using our Reusable Crosses to achieve desired grout joint size. In between thickness? Size up and use our Base Plates to ensure