Small, straight cylindrical BOSS-type knob, this one is ivory/cream colored (I'm getting rid of it because I bought the wrong one). Screw-on type (slotted screw), so it can be used for both metric and inch sizes. Base: 16mm Height: 11.89mm Shaft width: 6.4mm *I can also sell a set of 2 for ¥600, so please comment beforehand if you wish. Ivory cylindrical knob, for guitar effects. - Color: Ivory - Shape: Cylindrical - Function: Knob Thank you for looking.