The TruGlo StarBrite Deluxe is a compact fiber-optic bead replacement sight. This shotgun sight is the smallest diameter bead replacement made by Truglo. Fiber Diameter: 0.060". Fiber Length: 0.25". This model fits 2.6mm threads.
Specifications:

Type
Frame Material	CNC Machined Steel
Frame Color	Black
Firearm Fit	Shotgun
Base Configuration
Style	Fiber Optic Front Sight
Front Material	Fiber Optic
Rear Material
Front Color	Green/Fiber Optic
Rear Color
Rail Size
Windage Adjustment
Elevation Adjustment
Fiber Diameter
Firearm Type