Beta Roller Stud Extractors with 1/2 inch Square Drives. This product is designed for automotive and motorsport applications. Available sizes include 7mm with 1/2 inch square drives. Product Code: 014330007. Demon Tweeks was established in 1971 to service the needs of the motorsport competitor and our principals of offering top products, quality, service and rapid availability are as important to us today as they were in the very beginning. We are leaders in the supply of race wear, competition and road tuning parts for cars and bikes.