Victory Shok TL 2-Piece 50gr Black Inserts - 12 Pack - The Shok TL 7075 aluminum alloy construction broadhead adapter has an impact protection sleeve that strengthens arrow tip from fracturing. Increases impact resilience and durability, has a taper locking machining to improve strength and concentricity. Adapter accepts a standard 5/16” broadhead with an 8-32 thread. Shok aluminum insert VAP/TKO/VAP-SS .166 50gr