Brass round screw plug M need to use slot type screwdriver to tighten and fix 1.Our company is one of the largest leader of Brass round screw plug M and have built a loyal client base through the development and production of excellent quality. 2.Size:M12*1.5,16*1.5,18*1.5,20*1.5,22*1.5,25*1.5,32*1.5,40*1.5,50*1.5,63*1.5 MATERIALBrass with nickel platedO-SEALING ELEMENTMade of NBR or ...