1/4-20 UNC Solid Balls
1/4-20 UNC Threaded Solid Turned Balls
1/4-20 Balls made of Brass and Steel. Tapped Blind, Tapped Thru and Slip Thru type Thread Configurations.1/4-20 UNC Thread Measures 1/4in Diameter with a Thread Pitch of 20 Threads Per Inch. For Common Questions about Measuring Lamp Thread click here