Make sure this fits by entering your model number. TO CHOOSE YOUR SIZE - The spica splint is available in a right or left version. To select your size, use a soft, flexible tape measure and find the circumference around your wrist. Size MEDIUM RIGHT fits 7½” - 8½”. NEW & IMPROVED DESIGN (March 2019) - Based on customer feedback, we redesigned this De Quervain's brace for a more comfortable, secure fit. We also added new, medical-grade fastener, making it 10 times longer lasting than standard, OTC braces.