There are two types of oil tank containers for your T-shape glass speed cutter. One with 6 sides and the other one with 8 sides. Buy this item from Premium Aluminum as a replacement part for your existing speed cutter.

The T-shaped handle and the six-sided oil container suggest that it may be a tool that is used to cut glass in a precise and controlled manner. The use of oil, potentially as a lubricant, suggests that it may be a manual tool that requires some physical effort to use.

There are a number of different tools that are used for cutting glass, ranging from manual tools like hand-held glass cutters and running pliers to more complex and specialized tools like CNC waterjet cutters and laser cutters. The specific tool you are describing may be used in a variety of different applications, such as cutting glass for windows, mirrors, or other decorative or functional items.

It is important to use caution and proper safety precautions when working with glass-cutting tools, as the sharp edges of the glass can cause serious injury if handled improperly. Always wear protective eyewear and gloves, and follow the manufacturer's instructions for using the tool safely.