The Starrett 155 Screw Pitch Gage Includes A Substantial Steel Case With A Number Of Folding Leaves At Both Ends. This Product Includes 27 Leaves, 2-1/4-28 Tpi Range With Locking Device And A 60 Degree Center Gage.

• Most useful tool in any mechanic's tool box
• Quickly determines the pitch of a various threads
• Features a locking device at both ends of the case so leaves can be securely locked in position for use
• Leaves have a special narrow design, permitting checking internal threads in nuts as well as external threads
• Threads per inch 2-1/4, 2-3/8, 2-1/2, 2-5/8, 2-3/4, 2-7/8, 3, 3-1/4, 3-1/2, 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28