For 6Mm Diameter Shaft, Szliyands 2Pcs 32 X 13 Mm Aluminum Alloy Potentiometer Szliyands aluminum knobs are CNC machined from high quality solid aluminum with a durable anodized finish for a well-crafted product. This aluminum knob is the perfect replacement for your old knobs to replace or upgrade.If there is any item quality problem, we hope to improve your good shopping experience in this store by giving you an exchange or refund, if you have any questions you can contact us, we will usually reply your questions within 24 hours. Thank you for visiting our store and wish you a happy life. Product name: knob, Material : Aluminum, We have a small wrench for the knob,You may use it to adjust the shaft hole size,These knobs have no plastic inserts; they are CNC machined from a single piece of solid aluminum with anodized surface for durability. Size: 32 x 13 mm / 1.26" x 0.51" (d*h); inner Hole diameter: 6mm/ 0.23". Color: Black; Package : 2 x Knobs + 1 x Wrench