OIY1320 Features: * For determining the pitch of various threads * Pitch marked on leaf * Steel case * Narrow design of leaves permits checking of internal threads and external threads * w/Locking Device * No. of Blades: 28 * Measuring System: Metric * Type: Thread Pitch * Quantity: 1 per box * Price is for 1 Each * Testing and approvals: * Meets or exceeds accuracy and performance requirements of national and international standards and are traceable to the National Institute of Standards and Technology.