This listing is for Penny Washers in sizes of of M4, M6, M8, M10 and M12 in Steel Zinc Plate. These washers have different Outside Diameters and different Thicknesses. Also, there are various Pack Sizes available. Please choose your Washer Size and Pack Size using the drop down menus. Further details are as follows:

M4
Internal Diameter - 4mm
Outside Diameters - 10.5mm 
Thicknesses -  1.5mm

M6
Internal Diameter - 6mm
Outside Diameter - 19mm
Thickness - 1.3mm

M8
Internal Diameter - 8mm
Outside Diameter - 17mm
Thickness - 1.5mm and 1.5

M10
Internal Diameter - 10mm
Outside Diameter - 20mm

Thickness -1.5mm

M12
Internal Diameter - 12mm
Outside Diameters - 24mm
Thickness - 2.5mm