SLOTTED SHIM IS DESIGNED TO REDUCE PHYSICAL DISTURBANCES. THIS ITEM IS CONSTRUCTED FROM 300 SERIES STAINLESS STEEL. THE SLOTTED SHIM IS 4" WIDE AND 4" LONG. COMES IN SIZE C AND HAS A SLOT SIZE OF 1-1/4" INCLUDES THE FOLLOWING 20 EACH OF SIZE C SHIMS IN FOLLOWING THICKNESS: 0.001",0.002", 0.003", 0.004", 0.005", 0.010", 0.015", 0.020", 0.025", 0.050", 0.075", 0.100", 0.125"