Sizes of ring spanners are 6×7 , 8×9 , 10×11 ,12×13, 14×15 , 16×17 , 18×19 , 20×22 .
Hardness: 42 48 HRC ,Drop cast from top grade Chrome Vanadium Steel and Totally corrosion secure with Nickel Chrome finish.
Scientifically warmth treated to provide most strength and wear resistance.
Has close wrench opening tolerances giving Non damaging grip at the nut.
I phase design of care for and heads combines strength with low weight.
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