Sheet metal screw set 200 pieces affix 49 0122 this sheet metal screw set of 200 pieces features both round and countersunk heads with diameters of 2 9 4 2mm this superb set is ideal for metal fabricators and diy enthusiasts and is supplied in a plastic box the full range includes br br 50 tapping screw cylinder head 2 9 x 16mm br 30 tapping screw cylinder head 3 5 x 19mm br 15 tapping screw cylinder head 4 2 x 38mm br 50 pan head tapping screw 2 9 x 19mm br 35 pan head tapping screw