The Modal Shop 081A40 Mounting Stud is used to connect the 333D01 Digiducer® USB Digital Accelerometer to any of its mounting accessories. The mounting stud has a 1/4-28 UNF thread that mates with the 080A107 probe tip as well as the 080A121 flat and 080A131 curved surface magnets. The Modal Shop 081A40 Mounting Stud features a 0.438″ long stainless steel screw with a hex socket and brass tip.