Assortment contains 20 each of the following thicknesses: 0.001 in, 0.002 in, 0.003 in, 0.004 in, 0.005 in, 0.01 in, 0.015 in, 0.02 in, 0.025 in, 0.05 in, 0.075 in, 0.1 in and 0.125 in. Made from a 300 series stainless steel that resists rust and corrosion. Size B - 3 x 3 in. Slot size - 7/8 in. Packaged in a durable metal box. Precision Brand® Slotted shim is the best way to solve alignment and leveling problems on motors, pumps, generators and other plant machinery. Slotted shims are economical, safe and accurate. Reduce labor costs by eliminating hand cutting and reduce downtime by eliminating shim preparation. Precision Brand® Slotted Shim Kit, Plain, 300 Stainless Steel, 0.001 in Minimum Thickness, 1/8 in Maximum Thickness, 3 in Width, 3 in Length, 260 Piece