This Caliper Accessory Kit allows you to use your Electronic Caliper in a much wider variety of ways to measure your products. Measure the following applications Slots Grooves Webs Shoulders Holes Pockets Hard to reach features Works with 4", 6", & 8" Calipers, jaw maximum thickness: 0.146" Contains 1 pair each of the following... Mounting Tubes Conical Tips Disc Tips Spherical Flat Points