Features: _x000D_ brand and high quality _x000D_ This gun head is used with pneumatic nut nail gun, and cannot be used alone. _x000D_ This package includes four various sizes for you to choose _x000D_ Convenient to replace the broken one _x000D_ Adopt premium material and treated by fine workmanship, durable _x000D_ _x000D_ _x000D_ Specification: _x000D_ Size: M5, M6, M8, M10 (Optional) _x000D_ Shank: Hex straight shank, Hex clamp shank(Optional) _x000D_ Weight: Approx.94g~118g/3.3oz~4.2oz_x000D_ _x000D_ Package list: _x000D_ 1 set x Rivet Nut Head kit 1brand and high quality 2This gun head is used with pneumatic nut nail gun, and cannot be used alone. 3This package includes four various sizes for you to choose 4Convenient to replace the broken one 5Adopt premium material and treated by fine workmanship, durable