The cotter pin gets placed through the slots of the castle nut then slides through the hole of the fastener like a hex bolt with drilled hole

(Hickory Vine Loppers)

the sharpening blades can be reversed doubling its life span

Enjoy professional-level performance with each high-quality piece in the set

durable blade allows you to easily cut through branches and limbs without getting stuck or clogged

1/4-18 NPT/7/16 COMBO The cotter pin gets placed1 4 18 NPT 7 16 COMBO Tap and drill Combo pack offers correct drill size for the tap in one convenient package Tap offers precision cut threads, accurately formed for consistent, exact threading Tap is heat treated and tempered for file hard threads, and longer, useful life Tap designed for hand cutting applications Drill bit made of premium grade high speed steel