Fowler Screw Pitch Gage with 51 Blades

Features:
• 51 blades, 4 to 84 pitch standard V thread
• Narrow designed blades permit use for internal and external screw threads
• Locking device at each end to secure all blades for storage or position• Correct pitch is determined by matching blade teeth with threads• Precisely ground and finished• Blades marked with thread size