The Fat Bead is a large diameter fiber-optic bead replacement sight. This sight features 3-56" threads.
Specifications:

Type	Fiber Optic Bead
Frame Material	Steel
Frame Color	Black
Firearm Fit	Ruger, Winchester 1200/1300/1400/Super X2
Base Configuration	3-56
Style
Front Material	Fiber Optic
Rear Material	N/A
Front Color	Green
Rear Color	N/A
Rail Size
Windage Adjustment
Elevation Adjustment
Fiber Diameter	.100"
Firearm Type	Shotgun