Unicorn Gripper 4. A specially shaped shaft made of polycarbonate. The flights can be easily inserted and held securely in the shaft. Additional support for holding the flights provided by a shaft ring. 2BA thread. X-Short: Length: 29.0mm, Weight: 0.67g. Short: Length: 35.0mm, Weight: 0.78g. Medium: Length: 41.0mm, Weight: 1.03g. Long: Length: 47.0mm, Weight: 1.18g.