The Program Lock Key is necessary for these BF, HF and NF-Series Models: •BF-Series Mini Screwdriver Models
•BF-Series Standard Models
•BF-Series Soft Stop Models
•NF-Series Standard Models
•NF-Series Soft Stop Models
•HF-Series Models
The program lock key cannot be used with these BF-Series and NF-Series models:•BF-Series Standard Plus Models
•BF-Series Angle And Auto Reverse Models
•BF-Series Soft Stop Plus Models
•NF-Series Standard Plus Models