Pack of 80 in 4 colours & 3 profiles- snail, peg & double (large & small). Large double is 40mm long, small double is 25mm. Snail has maximum throw of 20mm. Peg cam is 25mm. They have 3mm or 2mm holes so take 3mm dowel and/or a matchstick. (reduce 3mm dowel to 2mm with a pencil sharpener/sandpaper). Made from injection moulded polythene.