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These are Great Planes Brass Threaded Inserts (1/4-20) FEATURES: Brass construction The perfect way to put threads into wood and mount engines to wood mounting rails. Threaded inserts make a simple & effective way to make wing hold downs. Can be used where blind nuts are hard to fit Comes in a Parts-Pak clear plastic box with resealable lid One year quality guarantee INCLUDES: (4) Threaded Inserts REQUIRES: 5/16" Drill Size (package says 3/8 but that is too large) Epoxy (GPMR6042) Standard Slotted Screwdriver (-) SPECS: Thread Size: ¼-20 Length: ½" Diameter: 3/8" OD overall 5/16" OD of main body COMMENTS: Package says it threads into a 3/8" hole. But it threads into a 5/16" diameter hole that is ½" deep. KPM 11/23/93 ir/jl kr3/18/03 specs, bit size & comments updated tjt 072705