VINTAGE PARTS FOR A WATCHMAKER'S OR JEWELER'S LATHE. 26 PIECES IN TOTAL. ALL ARE ABOUT 6 MM. MOST ARE UNMARKED, BUT THE ONES THAT ARE MARKED ARE ALL DALK. AS FAR AS I CAN MAKE OUT. THERE ARE 21 REGULAR COLLETS MARKED 4,6,7,8,14,15,16,18,20,22,23,27,31,36,40,57,99- AS BEST AS I CAN READ THOSE LITTLE NUMBERS. THE 4 STEP COLLETS ARE MARKED 1,2,3,4. THE FACE PLATE IS 3 3/16" IN DIAMETER.