410 Gauge, Hairpin Safety, 6mm Mount Threads, 303 Stainless Steel. This unit is very popular for halibut fishing. Normally mounted on a wood dowel (pole) using our Pole Mount Assy. AS013 "Sold Separately". If dropped in the drink it will float vertically. Ammo should be slugs not pellets which would contaminate fish.***** Rod & Ball Assembly Sold Separately ***** POWERHEAD WEIGHT: 7.3 oz.