This UNF and UNC Tap Set is perfect for use on AF vehicles and machinery. The tap wrench features screw adjustment and is suitable for M3 - M12 (1/16" - 1/2") taps. The die handle has an internal diameter of 25mm (1") with a thumbscrew to hold components securely in place. The set includes the following Tap & Die combinations: 1/8" NPT x27, 1/4" UNC x20, 1/4" UNF x28, 5/16" UNC x18, 5/16" UNF x24, 3/8" UNC x16, 3/8" UNF x24, 7/16" UNC x14, 7/16" UNF x20, 1/2" UNC x13, 1/2" UNF x20. It also comes with 1 X Die holder and 1 x Tap holder.