These elbow connectors prevent binding or kinking when you need to bend a dust collector hose at sharper angles. This elbow is at a 90 degree angle. Must be used with hose clamps or quick connectors. Overall length is 7.5" by 7.5" wide. Nominal dimensions: OD of both ends are 3 15/16" and ID are 3 11/16". These ABS plastic connectors are very economically priced to allow you to outfit your dust collection system for maximum performance. These fittings are made from 1/8" thick ABS abrasion resistant plastic and are designed to withstand the abrasive nature of wood chips and saw dust. Due to the potential for built up of static electricity, it is recommended that all dust collection systems with plastic fittings be properly grounded.