CAT 1 / Outer diameter 44mm
CAT 1.2 / Outer diameter 56mm, inner diameter 22mm
CAT 2 / Outer diameter 56mm, inner diameter 28mm
CAT 2.3 / Outer diameter 64mm, inner diameter 28mm
CAT 3 / Outer diameter 64mm / Inner diameter 37mm
CAT 3-2 / Outer diameter 56mm, inner diameter 38mm
CAT 4 / Inner diameter 50.8mm