Open End Wrench Set Alloy Steel Urethane Insulated Number of Tools 13 Range of Head Sizes 8 mm to 24 mm 10 Degrees Insulated Yes Box Metric Single End Rounded Cushion Grip 4 1/4 in to 8 1/4 in Head Thickness 5/16 in 3/8 in 13/32 in 7/16 in 15/32 in 1/2 in