Product Description Spring crown design puts staple legs under tension for superior driving power. Use in Bostitch tackers model No. T15, T15C, ET5-8, T5-8D4, EHS300, H30-8, EHS50, PC1000, and AC4000. Spring crown design puts staple legs under tension for superior driving power. This product is manufactured in Taiwan. This product meets customer requirement. From the Manufacturer STCR50191/2-4M