Here are 3 excellent condition black plastic and metal equipment knobs They have no cracks or chips and they have their set screws,. They will fit the 1/4 inch shaft and the larger one is about 1 1/2  inches in diameter and about 1 inch tall,the 2 smaller ones are 1 1/8 inches in diameter and 3/4 inches tall. .USA USPS 1st class shipping is $5.USPS International 1st class shipping is $15.