23 pcs/set for checking of nut and bolt UNC/UNF thread
size: No. 6 x 40 / No. 6 x 32 / No. 8 x 32 / No. 10 x 24 / No. 10 x 32 / 1/4“ x 20 / 1/4“ x 28 / 5/16“ x 24 / 5/16“ x 18 / 3/8“ x 24 / 3/8“ x 16 / 7/16“ x 20 / 7/16“ x 14 / 1/2“ x 13 / 1/2“ x 20 / 9/16“ x 12 / 9/16“ x 18 / 3/8“ x 11 / 5/8“ x 18 / 3/4“ x 10 / 3/4“ x 16 / 1“ x 8 / 1“ x 12