Features: The sewing hook & base containing the lower bobbin is twice the normal size, resulting in fewer bobbin changes, which is of particular use when using thicker than normal threads. This high-speed, automated bar-tacking machine generates a wide range of bartack patterns without operator effort. Fully automated, the operator merely programs the desired tack into the computer, and the machine will do the rest. This unit is perfect for producing a Box X stitch and Bar-tacking seams seen on aircraft & auto seat belts, cargo nets, harnesses, rigging straps, etc. Standard tacks, zig-zag patterns, and many other patterns are already pre-programmed. Optional & custom-made pattern clamps can be fitted within as little as 10 minutes after removing the pre-fitted bartack clamps.