【Ideal Usage】 Ideal for entry doors requiring extra security; paired with a complementary style smart lock or mechanical lock tongue for safeguarding your security. Front door handles fit standard doors with a backset of 2-7/20" or 2-3/4" (60mm-70mm)and a door thickness range of 1-3/8” to 2-7/20".(35mm-60mm) 【Enhanced Security】 Front door handle is 3-Level Security Certified by ANSI/BHMA（ANSI Code 156.2, 4000 Series）. 【Dual-sided Handle】 Door knob design for right and left-handed doors. It can be installed on either side of the door, saving you the time considering. 【Easy Installation】 No professional skills are necessary to quickly replace your existing front door handle, easy to install with just one screwdriver after drilling. 【Reliable Service】 HOSOM Lock enjoys a 3-year warranty and a 30-day return service. Your satisfaction is our top priority. 【Wide Application】 This front entry door handle is perfect for use with a mechanical or electronic smart deadbolt lock on entry doors and front doors in a home or office space for safeguarding your security.