The 1.035-40 thread, also known as the SM1 thread, is one of the most commonly used thread type used in optics and photonics industry. This adapter is made of stainless steel to provide sturdy engagement. Outside the adapter has a 1.035-40 thread, and there are three threaded holes on the adapter to fasten an additional component. Compatible with the lens tube products offered by Thorlabs and Newport Corporation.