Kits comprise of a single wad punch handle onto which screws a series of nine interchangeable punches. The handles are blackened and punches heat treated and chemically blacked. The handle should be struck with a hammer or mallet onto a wooden block. The spring loaded plunger in the handle enables holes to be accurately centred and serves to eject the slug. The metric set contains 5, 6, 8, 10, 12.5, 16, 20, 25 and 32mm sizes. The imperial set contains 1/4, 5/16, 3/8, 7/16, 1/2, 5/8, 3/4, 7/8 and 1in sizes.