Brunner Enterprisesâ„¢, Inc. is a stocking distributor of both custom and standard aluminum extrusions with a selection of over 200 different anodized aluminum extrusions, including all the basic angles, bars, channels, round, square & rectangular tubes, and schedule 40 pipe. Brunner Enterprisesâ„¢, Inc. also has handrail fittings and square tubing connectors for quick displays.