189A - cup washer (countersunk)

Countersunk type cup washer, nickel plated on brass, for 4, 6 or 8 size screw. usually used under screw head on woodwork cappings etc. specify size or send sample. per packet of 100 pieces.
4 screw size - 2.9mm, 7.05mm outside
6 screw size - 3.5mm, 8.85mm outside
8 screw size - 4.2mm, 10.65mm outside