This sale is for a new old stock, never been used ACME slip-fixed drill busing. It is 3/4" ID, 1" OD, 1-3/8" long under head and head diameter is 1.425". Made in USA. I have hundreds and hundreds of different sizes of these I will be listing over the next few days. Please see pictures and ask questions if you have them. We describe our items as accurately as possible. We do not know everything, so look at the photos as well as reading description completely. I will ship internationally and will combine shipping on multiple purchases.