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.