This replacement knock bar suits the Large, Medium and Small Coffee Knock Tubes. SKU: CK-SKT, CK-MKT, CK-LKT. It's a highly durable acrylic knock bar and is covered with a thick rubber sleeve which can be easily removed for cleaning or replacement. Durability and stability are the main features of a great coffee knock tube, and these knock tubes are durable, stable and built to last! If you're also looking for the rubber sleeve click here.