J4921M

features

• Locking hole to help hold crowfoot in place during use.
• Use with Proto® Locking Extensions to help prevent tool loss in awkward locations.
• Tight tolerance design to have a snug fit on fasteners.
• Open ends feature Proto® Anti-Slip Design (ASD)
• -Patented locking grooves help prevent the end from slipping off the fastener when turning.
• -Thearched surfaces are designed to spread the contact forces over a greater area.
• -Loads are kept off the corners or the fastener which helps prevent fastener rounding.