Fangrui Product Details The Bolt Size And Thread Quantity Regulations Have Common Standards And Public Thread Size, Identifying The 6 To 3/4inch And 4mm To 16mm Hardware. Each Size Has A Nut And Bolt Checker In The Same Amount. There Are 8 Holes Of The Nut And Bolt Thread Checkup, Which Are 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 1/4 Inches, 1/2 Inches, Which Can Help You Quickly And Accurately Determine The Screw Size And Recommend It. The Drill Or Tap Size Required For The Screw. Materials-bolts And Nut Recognition Instruments Are Made Of High-quality Materials And 12.9-level Hardness Tools Processed By Cnc. The Anode Oxidation Makes It Stable And . The Scale Line Is Printed By The Laser, And The Easy -to -read Tag Belt Has A Bright Black Background. Public Thread Size- X 0.7-m5 X 0.8-m6 X 1.0-m7 X 1.0- X 1.0-m 8 X 1.25-m10-m10-m10-m10 X 1.5-m2 X 1.25-m2 X 1.75-m14 X 1.5-m14 X 2.0-16 Mm X 2.0 British Thread Size-#6-32 Fine-#8-32 Fine-#10-24 Thick-#10-32 Fine -1/4-20 Thick -1/4-28 Thin-5/16-18 Thick-5 /16-24 Fine -3/8-16 Thick -3/8-