The ridger wheel has a diameter of 210mm. The diameter of the hole for the axle is 16 mm. The price in the stud is for one piece or one running meter (depending on the item in the advertisement). You can buy one piece or one meter of the item even though it is stated in the advertisement that it is packed collectively (we will complete the packaging for you and send as much as you order).The price in the price applies to one piece or one running meter (depending on the item in the advertisement ). You can buy one piece or one meter of the item even though it is stated in the advertisement that it is packed collectively (we will complete the packaging for you and send as much as you order).