Metro Case Multi-Grip for Sony RX100-3, RX100-4 Series: Front Grip with Thumb Rest & Arca Quick Release (Black) Compatible with Sony RX100-3, RX100-4 Front Finger Grip with Rear Thumb Rest Arca-Swiss compatible quick release with secondary tripod socket Easy access to USB & HDMI ports with the grip attached Extremely lightweight (37 grams)