These are Large Scale Control Horns from Great Planes.
FEATURES: Glass-filled for extra strength in giant scale or large sport-scale
A larger base provides more mounting stability
Mounting hardware is included
Control horn has 5-holes for different control throws
INCLUDES: Two Large Scale Control Horns
Two Control Horn Mounting Bases
Eight 4-40 socket head cap screws
REQUIRES: 3/32"-hex head wrench to tighteh 4-40 cap head screws.
1/8"(3mm) Drill bit, to drill holes in mounting plate.
SPECS: 4-40-Screw Length-(34.1mm) (1.346")-Thread Only-(23.7mm) (.935")
Base Length-------(25.1mm) (.988")
Base width at widest point-(24.2mm) (.954")
Control horn at highest point from bottom of base-(34.1mm) (1.346")
COMMENTS: Mounting Template on back of header card in package