• Front of center outsert system designed for maximum penetration, maximum F.O.C. and shot after shot performance • Built for Rampage shafts • 3 part system first consisting of a stainless steel retention post that acts as a footer inside the carbon shaft • Second either a black 7075 T6 aluminum alloy or stainless steel outsert that will slide over the shaft for concentric engagement • Third a 3/32 allen head retention screw that allows for outserts to be removed or re-installed, this is excellent for broadhead indexing • Aluminum FOCOS system weighs 100 grains for all spines • Sold in a dozen pack (will include all 36 pieces)