Griffin Glass Tool's Female Joint Forming Tool

-Use our ground joint forming tools and tool sets to quickly and efficiently make your own male and female joints. We offer 3 sizes and 2 handle types. 10mm, 14mm, and 19mm with either a wooden or aluminum handle. Aluminum can easily be chucked in a lathe if needed. Although we sell the tools individually, most people do chose to purchase them as a set. -To form a female Joint, use the reamer for 90% of the shaping and the brass plug for the final touch up and fine tuning. The plug should be used in a quick forming step while marvering. Use the plug while the glass is slightly molten and remove before the orange glow is completely gone. REMEMBER, always remove while still molten to avoid checking or sticking.