Keep parts organized when the instrument is disassembled. The Clarinet block will hold pivot screws and rods and is separated into Upper Joint and Lower Joint. There are places for the most common rods and screws and a storage area for small parts. Each block has a convenient thru-hole to allow for storage on a nail or hook. The blocks are durable with a surface that is resistant to oils and grease. Dimensions: 4.7 x 6 x 0.73 inches (12 x 15 x 1.84 cm)