12 Gauge, This unit is very popular in shark fishing. Normally mounted on a wood dowel (pole) 1-1/4" Dia. x 6' Long. Using our pole mount AS015 "Sold Separately". This unit has a very high recoil! Should not be used with any of our Rod & Ball Assys.!!! (NOT TO BE USED WITH ROD & BALL ASSEMBLY),Hairpin Safety, 6mm Mount Threads. 303 Stainless Steel, POWERHEAD WEIGHT: 9.5 oz.