Radial Bar Wrist Cock-Up SplintAngled to ensure clearance at the MP crease. Extended ulnar border and flared forearm trough provide support when the splint is dorsal or volar. Available in 1/8in (3.2mm) NCM Preferred and 1/8in (3.2mm) NCM Clinic Smooth, 1/8in (3.2mm) NCM Preferredr Perforated and 3/32in (2.4mm) NCM Preferred Smooth. Package of three. Instructions are included.Small MP Joints: 6-1/2in to 7-1/2in (16 to 19cm) Wrist: 5-1/2in to 7-1/2in (14 to 19cm) Forearm: 8-1/4in to 9-1/2in (21 to 24cm) Medium MP Joints: 7-1/2in to 8-1/2in (19 to 21cm) Wrist: 6-1/2in to 8-1/2in (16 to 21cm) Forearm: 9in to 10-1/2in (23 to 26cm) Large MP Joints: 8in to 9in (20 to 23cm) Wrist: 7-1/2in to 9-1/2in (19 to 24cm) Forearm: 10-1/2in to 12-1/2in (26 to 32cm).