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Your cart is empty.This IRWIN SPEEDBOR MAX 12" Shaft Extension features a manual locking design, which securely holds 7/16-inch hex bits. SPEEDBOR MAX bits feature 3 durable cutting edges that are resharpenable to extend the life of the drill bit. The aggressive screw pitch pulls the bit fast for clean, true holes, while the 7/16-inch impact shank helps reduce slipping in standard chucks.
Mistral
December 1, 2024
I bought this as an extension for a forstner bit to chew out the remains of a fence post. Together they were effective and held up well.
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