Starrett sheet metal micrometers are used for measuring the thickness of paper, plastic, sheet metal and rubber parts. They feature a thimble design & a balanced frame for easy handling & better readability, and speeders & combination ratchets for uniform pressure & quick adjustments. These micrometers are integrated with ring-type knurled lock nuts for quick & sure locking, and feature satin chrome finish for rust resistance. Choose from a wide range of these sheet metal micrometers, available in flat and round anvils.