These alloy dart shafts have a 2BA dart barrel thread, shaft removal hole, contoured shaft and quad-fin dart flight holder.To correctly measure a dart shaft length measure the length of the actual dart shaft itself, the threaded section is not included in the measurement.Dart shaft lengths: Mini (15mm), Extra Short (30mm), Short (33mm), Medium (36mm), Standard (46mm).Each pack contains 3 x 2BA thread alloy dart shafts.