Acorn's thumb turns. This oval-shaped thumb turn is ideal wherever a thumb turn is required, but especially for use with locks furnished by Acorn or other manufacturers. The thumb turn, completed in smooth iron with a black matte finish, involves a simple turning system, spindle and tail pieces (an oval-shaped back plate), and a bean-shaped turn piece (diamond). The Smooth Iron hardware is typical of Early American styling, with a flat black appearance that simulates the hardware as it was originally forged. Spindle & tail pieces 1.5" L, diamond 0.1875" L. Sold by each.