The Two-Piece Clamping Collar Kit is packaged in a durable plastic box and contains five each of the following sizes: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" and 1". Hex keys in sizes: 3/32", 7/64", 9/64", 5/32", and 3/16" are included.