Much like DIN eighty four, but with a bigger head diameter and a rather unique head profile. Made to ISO 1580 or DIN 85. Be sure to Be aware that resulting from production restrictions, all nylon variants of these things are only "just like" instead of "in absolute accordance with" https://stainless-steel-banding-s33197.imblogs.net/80384511/facts-about-masonry-screws-revealed