The RL17SR 3 IC Arrow Cylindrical Lock The RL Series offers removable through bolts and a wide variety of design. Classroom Lever Lock, SR Lever Trim Design, SFIC Prep Less Core, Bright Brass The RL Series has been enhanced to offer removable through bolts and a wide variety of designs, finishes and functions. The RL Series cylindrical locksets are an economical value for a variety of application. Perfect for multi-family housing markets, as well as light commercial applications.