A-TAC™ 4-Blade Cut-on-Contact 100 gr Screw-In Fixed Broadheads by Trophy Taker®. 2 Pieces. Solid Steel, Bone Breakin' Design. A-TAC Broadheads reap toughness and are engineered for accuracy and devastating penetration. A single piece, stainless steel blade slips through the ferrule and locks into place to round out the four blade design. This 0.080" thick main blade is twice as thick as most blades on the market and honed to a razor sharp edge. The cutting diameter of the main blade is 1.125". This cut-on-contact head has clearly been designed to hunt anything that a bowhunter is willing to draw on.