This is the Ateco #1 standard decorating tube tip. The decorating tube tip fits with a standard coupler and it is made of stainless steel.

Specifications
Ship Weight0.01 lb
ManufacturerAteco (August Thomsen)
Model Number1
Manufacturer Part #1
Type                  Piping Tips
Base MaterialStainless Steel
Color                   Silver
Shape                   Round
Tip Size                   Standard
Style                  Plain
Base Diameter SizeSmall
Tip Opening Size0.0525 Inches
Hand Wash OnlyYes