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Manufacturer : Proto
Brand Name : Proto®
Country Of Origin : US
Drive Size : 3/4 in
Drive Type : Square
Finish : Black Oxide
Standards : ASME B107.110|Federal Specification GGG-W-660A
Product Status : Active
- Use extensions to gain access to fasteners in locations that would otherwise be difficult to reach
- Male square is oriented inline with female squares for use with fixed head torque wrenches
- Full chamfer at drive opening for easy engagement with drive tools
- Constructed of high quality tool steel drive end chamfer and four detents help provide quick positive engagement with drive tool on any of the socket drive walls
- Features 2-thru holes and a groove to accept a Proto® retaining ring or pin or O-ring to help secure extension to the drive tool anvil
- For use with impact sockets
- 1-piece construction ensures concentricity
- Special heat treat ensures long life
- Precision machined tips for proper fastener engagement


