21mm 4-Point (Square) Standard Length 1" Drive Impact Socket

• Grey Pneumatic Impact Sockets are designed for professional tool users.
• They are engineered specifically for use with impact tools, using the most up to date industrial specifications.
• Grey Pneumatic Impact Sockets are made from high quality alloy steel (chrome-molybdenum).
• Thorough and exact heat treatment insures the correct balance of strength and durability.
• Grey Pneumatic Impact Sockets are tested to the highest specifications to deliver outstanding performance.

• Increased Strength-Transfers the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength.
• Increased Torque-Allows up to 20% more torque to be applied than on standard hex impact sockets.
• Easier Access to Tight Area-The shift in pressure allows us to reduce the socket wall thickness, increasing access to tight areas.
• Reduced Wear-The impact sockets grip the fastener across a broader contact area, reducing the chance of rounding off fasteners.
• Designed specifically for inner budd-style square fasteners on truck wheels.

• Square Size: 21mm
• Drive End Diameter: 2.05"
• Socket End: 1.73"
• Bolt Clearance Depth: .94"
• Length: 2.24" 

Grey Pneumatic 4321S 21mm 4-Point (Square) Standard Length 1" Drive Impact Socket GP4321S