It's a cylindrical handle 1000 PB (8300 PB)
Specification
ㆍ Backset : 2-3/8"(60MM)
 ㆍ Door Thickness : 1-3/8"(35MM)~1-3/4(45MM)
 ㆍ  Latch Front : 57*25.4MM
 ㆍ Strike : 70×28.0mm (T STRIKE)
 ㆍ Latchbolt : 7/16"(11.0mm), Zinc
 ㆍ Cylinder : Keyed type (Kwikset System 5Pins)
 ㆍ Key system : KA, KD, MK
Features
ㆍ KSB6411 Tubular Type 20 (2TA) Standard Certification
 ㆍ Easy to replace and install existing door locks
 ㆍ It has a sophisticated design and interior effect
 ㆍ Precision key system
ㆍPB