The PRAX and PRAX/C spring plungers are made of AISI 303 stainless steel with a threaded tip and body, equipped with a locking position. The knurled handwheel is made of black technopolymer reinforced with glass fibers and a matt finish. Dimensions include M12x1.5 and M16x1.5 threads, with diameters from 26 mm to 32 mm and weights from 30 g to 76 g. The PRAX/C version is equipped with a lock nut in AISI 303 stainless steel.