Head Set Product Type Head Set Compatible Thread Size M4 Compatible Rivet Nut Body Type Hex Material Steel Overall Length 2 11/64 in System of Measurement Metric Compatible Insert Type Rivet Nuts Compatible with Manufacturer Model Number FL5-HS-00904 FL5-HS-01004 FL5-HS-09104 FL5-HS-M4 M-M4-45 Includes Headset Only