Made of 304 stainless steel with good stability. Easy to install, practical and durable. Widely used in fence, burglarproof doors and windows, canopy, air conditioning rack fixation, home decoration, engineering, etc. Put the expansion screw into the ground/the hole on the wall, then tighten the nuts of the expansion bolt with wrench. The bolt goes outside while the metal sheath does not move at all. The bigger head of the bolt will expand the metal sheath to make it fill the whole hole. Finally, the expansion screw can not be pulled out. Specification: Material: 304 stainless steel Color: As picture shows Size M8x60mm(D x L): 11.64mm x 60mm/0.46inch x 2.36inch M8x70mm(D x L): 11.54mm x 70mm/0.45inch x 2.76inch M8x80mm(D x L): 11.54mm x 80mm/0.45inch x 3.15inch M8x90mm(D x L): 11.6mm x 90mm/0.46inch x 3.54inch M8x100mm(D x L): 11.6mm x 100mm/0.46inch x 3.94inch M8x120mm(D x L): 11.5mm x 120mm/0.45inch x 4.72inch M8x140mm(D x L): 11.5mm x 140mm/0.45inch x 5.51inch M8x150mm(D x L): 11.34mm x 149.1mm/0.45inch x 5.87inch Package Includes: 1 piece M8 Expansion Screw Note: Please allow 1-3cm differences due to manual measurement.