The winch lock bolt is a custom 3/8-16 precision security bolt made from 1045 carbon alloy steel heat treated to Grade 5 yield strength.The key patterned head bolt is proprietary and the matching key is not available at the hardware store.Winch Rope RollerSpecifications: Description_EXT The winch lock bolt is a custom 3/8-16 precision security bolt made from 1045 carbon alloy steel heat treated to Grade 5 yield strength.The key patterned head bolt is proprietary and the matching key is not available at the hardware store. Description_FAB Simple fail proof design : no clumsy traditional key mechanisms to corrode/fail Description_FAB The winch lock bolt is a custom 3/8-16 precision security bolt made from 1045 carbon alloy steel heat treated to Grade 5 yield strength. Description_FAB The winch lock bolt cannot be removed with ordinary screw drivers, pliers, or commonly sold security bits. Simply substitute one of your winch mounting bolts with the Winch Lock bolt and your winch is protected Description_FAB Fits all winches with standard 3/8 -16 mounting hardware- shank length 1.25 inches Description_FAB Made in the USA Description_FAB Limited 1 Year Warranty Description_INV WINCH LOCK ASSEMBLY 3/8-16 Description_SHO Winch Rope Roller Description_DEF Winch Rope Roller