The Profoto Speedring Adapter for Bowens / Calumet / Aurora / Fomex flash heads is designed to rotate 360 degrees, offering maximum creative flexibility. The speedring features sockets for heat-resistant, colour-coded softbox rods for quick assembly. It fits RFi four and eight-sided softboxes, each having colour-coded rods that match the speedring.nnSpecificationsnnConstructionnn- Aluminium, steelnnCompatibilitynn- RFi Softbox 1.3 x 2.0' (40 x 60 cm)nn- RFi Softbox 1.0 x 1.3' (30 x 40 cm)nn- RFi Softbox 1.0 x 3.0' (30 x 90 cm)nn- RFi Softbox 1.0 x 4.0' (30 x 120 cm)nn- RFi Softbox 1.0 x 6.0' (30 x 180 cm)nn- RFi Softbox 2.0 x 2.0' (60 x 60 cm)nn- RFi Softbox 2.0 x 3.0' (60 x 90 cm)nn- RFi Softbox 3.0 x 3.0' (90 x 90 cm)nn- RFi Softbox 3.0 x 4.0' (90 x 120 cm)nn- RFi Softbox 4.0 x 6.0' (120 x 180 cm)nn- RFi Octa Softbox 3.0' (90 cm)nn- RFi Octa Softbox 5.0' (150 cm)