Manfrotto 237 Flexarm Standard 55cm; Flexible arm to hold reflectors or flash heads; with pin for Super Clamp with 3/8'' internal thread and on the other side with a 16 mm (5/8") bolt and 1/4" thread (=Type 18); Length: 55 cm; Diameter of flex arm: approx. 13 mm; Load capacity: approx. 0.3 kg; Weight: 0.35 kg