Open End Wrench Set Alloy Steel Urethane Insulated Number of Tools 13 Range of Head Sizes 1/4 in to 1 in 10 Degrees Insulated Yes Box SAE Single End Rounded Cushion Grip 3 7/16 in to 8 7/16 in Head Thickness 1/4 in 9/32 in 5/16 in 11/32 in 13/32 in 29/64 in 15/32 in 1/2 in