REMOVE FROZEN FASTENERS EASILY - Our 2-piece pneumatic bolt breaker set (37315 3/8" & 37316 1/2") uses air hammer vibration to loosen seized bolts, nuts, and Torx fasteners that won't budge DUAL-ACTION DESIGN - Features square drive ends (3/8" & 1/2") for impact sockets PLUS built-in 19mm/¾" hex shaft for wrench leverage - perfect for GM caliper and bearing removal UNIVERSAL COMPATIBILITY - Standard .401 turn-type Parker shanks fit most air hammers and impact guns for versatile automotive and industrial applications INDUSTRY-STRONG CONSTRUCTION - Heat-treated steel adapters withstand heavy-duty use on stubborn or overtightened fasteners without breaking COMPLETE 2-PIECE KIT - Includes both 3/8" and 1/2" drive bolt breakers - everything needed to tackle frozen fasteners in one purchase (customer support guaranteed)