Panasonic DMW-HGR1-K Ergonomic Hand Grip for GM1 and GM5 Mirrorless Digital Cameras, Black Panasonic DMW-HGR1-K Hand Grip - 1/4"-20 Thumb Screw - Panasonic 1 Year Limited Warranty Material of Construction: Aluminum Alloy Dimensions: 3.9 x 1.6 x 1.2" / 99.06 x 40.64 x 30.48mm Weight: 1.5oz / 42.52g