The item shown is an Epistar or Epica branded glass cutter used for scoring and cutting glass.
Cutting Wheel: Equipped with a precision carbide wheel for clean scoring.
Handle: Features a durable metal handle, often with a ball end for tapping and snapping the glass.
Function: Designed for glass thicknesses typically ranging from 3mm to 12mm.
Usage: Used by drawing the wheel across the glass surface to create a weakness for breaking.