Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
KEYS & LOCKS MATH ACTIVITY that kids are sure to do again and again! - matching, fine motor development, number recognition or I would put addition/subtraction problems on the locks and answers on the keys later in the year.