FUNCTION: CASTLE NUT / TORQUE WRENCH TOOL BUILD: STAINLESS STEEL COMPATIBILITY: M4 / M16 COLOR: STEEL FEATURES WRENCH TOOL COMPATIBLE WITH M4 AEGS AND GBBRS FEATURES MULTIPLE TOOLS IN ONE PACKAGE ASSISTS IN DISASSEMBLING/ ASSEMBLING OF M4/16/M4 TYPE RIFLES FULL METAL CONSTRUCTION WITH A SLIM PROFILE NECESSARY FOR THOSE WHO UPGRADE THEIR AIRSOFT PARTS REPLACE OR UPGRADE YOUR BUFFER TUBE TO SUIT YOUR NEXT MISSION LIGHTWEIGHT, STURDY AND EASY TO CARRY