Great set for the handyman.  Will work on R12/R22/502 systems.  ALSO has R134a snap couplers included for R134a, R22, or R12 use.
Hoses are compatible with R12, R22, R134a, and hydrocarbons
Gauge set includes: 
60" hoses
snap couplers
sight glass with moisture indicator
Gauge set features:
zeroing adjustment screw
gauge pads
1/4" ends
anti-flutter
If charging using small cans, please purchase the Blue Top Can Tap with adapter #5005. This can be found under the Tools section. 
To make this EPA approved, purchase #3368 Inline hoses.