6" Cast Iron Closed Ring with Boss Head Clamp Base Size_6 x 4" Two-cylinder brass fluid-pressure apparatus with

Two-cylinder brass fluid-pressure apparatus with 19mm and 38mm leather-packed pistons connected by a brass tube

with 4mm sockets at each end for resistivity comparison

Used as the red-rail partner to the 150mm black 4mm-stackable lead

Six-piece 3-inch optical lens set combining three double-convex and three double-concave glass lenses at 200mm

fabricated from glass tubing 6 mm bore

6" Cast Iron Closed Ring with Boss Head Clamp Base Size_6 x 4" Two-cylinder brass fluid-pressure apparatus withCast iron closed ring clamp with an integrated boss head, combining an approximate 5. 5 inch inner diameter with a rod grip up to 5 8 inch for large vessel support above heat sources.