Sizes from left to right:
Small: .375 x .878 x 1.350 long
Medium: .375 x 1.000 x 1.550 long
Large: .375 x 1.070 x 1.825 long
Tactical: .375 x .855 x 1.875 long
Click on a photo for a larger view.
Knobs can be made from alluminium, steel, stainless steel, brass, copper and plastic. They come polished, teflon duracoated or hard anodized. They can be solid or fluted and can have the end hollowed out.