Ultra Flex Support System with Base Plate is designed with a stable base plate that fits easily on bench tops or in fume hoods. System includes the three interchangeable clamp heads that make it extremely versatile; 2-prong clamp head, 3-prong clamp head and spring clamp head. The system also includes the nickel plated flex arm in 12" (30.5cm) or 18" (45.7cm) length, steel base plate with chemical resistant black finish and utility wrench. Maximum grip size (1) 2-prong clamp head: 75mm, (2) 3-prong clamp head: 69mm, (3) spring clamp head: 13mm.