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. Length: 1/2", Crown Size: 7/16", Pkg Qty: 50. 00----1 Since it is imported overseas, even if it is brand new, there may be some damage to the package, but please rest assured that this does not affect the product. 2. Product **and other products made in Japan are not applicable. 3. Packaging and instructions are in English.