This is item no. SELC-12. This is a 1/2" bore bearing lock collar. The OD is 11/16". These are usually used to hold a bearing onto a 1/2" shank bit. You could use two of these to hold a bearing up further on the shank if you needed to. Shipping on this item is free via USPS or UPS. I do combine shipping wherever possible. I do ship internationally. Just email me and I will quote shipping to your country.