This sale is for 2 different new old stock, never been used APEX brand Phillips bits to fit Stanley Yankee model 31 and 131 ratcheting screwdrivers. There is a No. 1 & a No. 2 sized bit and the shank diameter is 5/16". Made in USA. 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.