C.E. Smith Post Guide-On 65" - Aluminum. This guide-on fits channel frames up to 4 wide by 5-1/4 tall and any size of I-beam frame due to the two mounting options included. The metal uprights can be adjusted up to 19 out from the side of the frame. Specifications for C.E. Smith Post Guide-On 65": Manufacturer: C.E. Smith Color: Silver Quantity: 1 Package Contents: C.E. Smith Post Guide-On 65" C.E. Smith 27638: Post Guide-On 65" - Aluminum