This prism assembly design incorporates a simple stainless-steel locking mechanism that's easy to set while adjusting the prism and target tilt. The heavy-duty 62mm silver-coated prism is sealed in a strong canister with an O-ring to prevent water and dust from getting inside. The prism can be mounted in either 0 or -30mm offset positions. This assembly features a 6 x 9-inch target size. The tilting axis height is 115 mm.