The M26 series cartridge caulk guns features a 26:1 high thrust ratio, it is best use with thicker material like polyurethane or in cold weather where the high thrust ratio offers superior power on each squeeze action and reduce hand fatigue. Comes with two standard sizes fits 10 oz. cartridge (M26S) or a 1-quart cartridge (M26L). The caulk gun features an ergonomic grip, a curved hook for hanging on racks or ladders and a thumb-operated pressure release lever.