These are the U-Brackets and Screws for the Altimaster II altimeter.
This includes 2 U-Brackets and 4 Screws. This is used to attach the Altimaster II to a pillow/cushion mount or velcro wrist strap. A full U-Bracket Kit with Velcro Wrist Strap as well as the Pillow/Cushion Altimeter Mount are available separately from ChutingStar.com.
These U-Brackets can also be used on an Altitude Awareness Trainer.