This Screw Block will hold pivot screws from all makes and models of saxophones. There are also places for guard screws, neck screws, lyre screws as well as holes for miscellaneous screws. 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: 7.13 x 4.7 x 0.73 inches (18 x 12 x 1.84 cm)