45° Long Offset Box End Wrench (10 pieces) N-PowerFit Drive- Increased strength and reduces rounding or fastener damage by distributing stress through a gentle arc in the bore by enlarging the contact surface. . Comes with Case. Exceptional surface finish- Proprietary hard chrome plating for anti-wear, anti-corrosion, and superior appearance.. Optimal fastener fit- industry leading tolerances reduces the fit gap with bolts and nuts to the absolute minimum, creating a superior fit feeling.. Non-slip grip M2510