Maun MAUWPKM Metric Wad Punch Kit 1000/05 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. Set contains: 5,6,8,10,12.5,16,20,25 and 32mm sizes.