MILL-MAX Adds 2 New Receptacles With Organic Fibre Plug® Solder Barrier – 10 Sizes Now Available; 8 On Tape - Mill-Max’s knock-out-bottom receptacles are discrete sockets for soldering into printed circuit boards. Ten sizes are now available; eight have carrier tape as standard packaging. Tape packaging is becoming increasingly popular since it permits thru-hole components to be placed simultaneously with surface mount parts on pick-’n-place assembly lines.