The extremely lightweight thumb support slots into the M10 or M11 hot shoe to improve ergonomics. It helps provide secure camera handling, especially during one-handed shooting. It enables longer exposure times or shutter speeds with reduced risk of camera shake. Its design visually integrates with the Leica M10 and M11. The thumb support is CNC-machined from brass. It uses the same classic surface coating as the Leica M10 and M11 for a matching appearance when attached.