Deep Six insert compatible 1-1/8" cutting diameter Over-bore technology and offset blades Trophy Tip Reliable expansion Massive wound channels Field Point accuracy NAP has re-designed one of the most effective fixed-blade broadheads of all time to develop one deadly broadhead. The Thunderhead Razor features an offset blade design for more arrow spin and pinpoint accuracy at longer ranges. The Razor also features NAP's straight-edged blades for renowned sharpness and the patented trophy tip specifically designed for bone splitting penetration. The Deep Six model is designed specifically for use with the Deep Six insert system and is not compatible with conventional arrow inserts.