Otis Technology, Multi Caliber Shotgun Cleaning Kit WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Cleans all 12 & 20 ga shotguns 12 & 20 ga bronze bore brushes and cotton mops with size marked on stem Shotgun pierce point jag with 12 & 20 ga felt patch savers (6 each) Product Description Everyone's got a trusty shotgun or two (or three or four). Get the Multi-Gauge Shotgun Cleaning Kit from Otis and you'll have your 12 & 20 gauge shotguns cleaned and maintained in no time. This kit includes everything you need for quality shotgun maintenance, featuring solid brass rod sections.