This useful sheet music and concept holder attaches easily to the "Spider Pro" Models 18860 or 18840. The stable clamp with the ergonomic clamp lever allows a variable height adjustment. The angle is set using a mesh teeth joint, ensuring that it is securely in place. The distance and direction of the sheet music holder can be set using a clamping screw. The music desk is 296 mm high and 416 mm wide. The music desk can be removed separately with the sturdy K&M prismatic "V-block" connector.