6" Cast Iron Closed Ring with Boss Head Clamp Base Size_6 x 4" this insulated 4mm-stackable safety lead

this insulated 4mm-stackable safety lead carries up to 12A through nickel-plated split-hollow pins for branched-circuit student work

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

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

Ticker tape holder stand with a 10mm stainless steel rod on a textured metal base

6" Cast Iron Closed Ring with Boss Head Clamp Base Size_6 x 4" this insulated 4mm-stackable safety leadCast 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.