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Facility Hand Tools Wrenches Combination Wrenches Proto PTO577-SCR28

Proto Spline Non-Reversing Combination Wrenches

Item # PTO 577-SCR28 by Proto (Mfg. Part # 577-SCR28)


Black chrome finish is corrosion resistant and visually distinctive
Non-reversing ratcheting wrenches can be flipped over to turn the fastener in the opposite direction
Ratcheting spline box end is countersunk for easy application to the fastener
Spline design also helps prevent rounding of corners and other fastener damage that could lead to Foreign Object Damage (FOD)
Spline design enables the wrench to contact conventional fasteners away from the corners, which help apply force over a large area helping to reduce risk of fastener rounding
Spline design was created for use with specialty spline bolts which are used when weight and size of bolt heads must be minimized
Anti-Slip Design (ASD) open end
Fractional spline wrenches can be used on fractional 4, 6, 12 point, spline and Torx® fasteners
Loads are kept off the corners of the fastener which helps prevent fastener rounding
Patented locking grooves help prevent the wrench from slipping off the fastener when turning
The arched surfaces are designed to spread the contact forces over a greater area
The high contact surface area which is away from fastener points enables turning of highly rounded fasteners


  • Opening Size : 7/8 in

  • Opening Type : Open/Box

  • Head Width : 1 13/16 in

  • Overall Length : 11 7/16 in

  • Finish : Black Chrome

  • Measuring System : Inch

PTO577-SCR28 - ProtoSpline Non-Reversing Combination Wrenches
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Retail Price: $39.84
BettyMills Discount Price: $29.51 Each
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