<BR><BR> All pieces have recessed rim for easy mounting. Set includes rubber grommets (inside diameter x outside diameter x depth): 1/8 x 1/4 x 1/4, 7/32 x 5/16 x 3/8, 9/32 x 1/2 x 5/16, 1/2 x 19/32 x 5/16, 3/8 x 15/32 x 5/16, 3/8 x 1/2 x 1/4, 5/16 x 9/16 x 3/8, 3/8 x 13/16 x 5/16, 7/16 x 3/4 x 5/16, 5/8 x 31/32 x 5/16, 3/4 x 15/16 x 5/16. Rubber plugs in outside diameters (all 1/4 thickness): 9/32, 1/2, 5/8, 3/4, 7/8 and 1. See-through organizer case has 18 compartments to keep items organized and easy to identify; double latch lid.<BR>