The P87 was design to work in the tuning slide area of a variety of horns. With a length of 3 inches and a total of 97 sizes starting at .438 clear up to .630. Precision ground in .002 increments this tool is able to repair and tweak any tight fitting or damage tubing to create a smooth operating slide. P87A Individual Slugs Designed to work in the tuning slide area of a varietyof horns. Length of 3" and a total of 97 sizes.Starting at .438" thru .630". Precision groundin .002" increments. This tool is able to repair andtweak any tight fitting or damaged tubing to create asmooth operating slide. P87A 3" slug, individual sizes, .438 thru .630 (#1-#49 and #50-#97)P87H Set of 2 handlesP87S-1 Set of slugs, #1-63, w/storage blockP87S-2 Set of slugs, #64-97, w/storage blockP87S-3 Complete set, #1-97, w/storage blockP87S-10 Set of 10 slugs (you choose sizes)P87W-1 Wood block only for #1-63P87W-2 Wood block only for #64-97