Full length: 52mm (2.0in) Weight: 45g (1.6oz) [air] / approx.20g (0.7oz) [underwater] Full length: 72mm (2.8in) Weight: 78g (2.8oz) [air] / approx.45g (1.6oz) [underwater] Compatible products（Top 1/4-20UNC screw） Single Light Holder LF for Tripod Single Light Holder LE for Tripod SD Mount Cage for HERO3/3 /4 Action camera/compact digital camera equipped with "1/4-20UNC" tripod screw hole (screw hole depth 5mm or deeper).