ProSource Entry Knob Lockset, Tulip, PB, KA3, BX PK

For keyed exterior doors. Both knobs lock and unlock by key outside or turnbutton inside. DOOR THICKNESS: Fits 1-3/8 in to 1-3/4 in doors. BACKSET: Adjustable 2-3/8 in to 2-3/4 in. STRIKES: Full lip 1/4 in radius.