Lengthening shims fit over the stripper screw threads and under the shoulder which, in effect, lengthens the stripper screw length. contains 3 thicknesses: 0.005 in from 1095 blue tempered spring steel and 0.015 in and 0.032 in from 1075 tempered spring steel. Fits six different shoulder screw sizes from 1/4 in to 3/4 in Dia. Precision Brand® 270-piece lengthening shim contains 15 each of the following sizes: 0.171 in ID x 0.248 in OD in 0.005 in and 0.015 in, 0.187 in ID x 0.248 in OD in 0.032 in, 0.234 in ID x 0.308 in OD in 0.005 in, 0.015 in and 0.032 in, 0.289 in ID x 0.371 in OD in 0.005 in and 0.015 in, 0.296 in ID x 0.371 in OD in 0.032 in, 0.352 in ID x 0.496 in OD in 0.005 in, 0.015 in and 0.032 in, 0.473 in ID x 0.621 in OD in 0.005 in, 0.015 in and 0.032 in and 0.598 in ID x 0.746 in OD in 0.005 in, 0.015 in and 0.032 in. Precision Brand® Lengthening Shim Kit, Spring Steel, 0.005 in Minimum Thickness, 0.032 in Maximum Thickness, 270 Piece