Size - 1" Steel Pipe, 36 inches (91.4cm) long, set of 4. Characteristic - Heavy duty pipes, used for home decor. Compatible with NPT 1" fittings. Material & Products - GeilSpace pipes are designed with a standard industrial finish; materials and threads constructed from sturdy metal. Our product’s surface is rust-proof when the protective paint layer is intact. How to Use - Unleash your creativity and bring chic, industrial style into your home, office，garage, workshop or any other space with GeilSpace fittings and pipes; choose from our large selection of standard, unique and innovative fittings and pipes to create custom furnishings limited only by your imagination. Note - These pipes are painted black, if protective painting at both ends makes pipes hard to screw into fittings, please remove the black painting. (Use knife to cut along thread) The pipe does NOT work with pipe clamps. O.D. of these pipes is smaller than the NPT 1" pipes. (O.D. of these pipes: 32.3mm; O.D. of standard pipes: 33.3mm.)