• Wide board offers plenty of working space
• Variety of working tools to measure and mark
• Heavy-duty piece; well made and sturdy
Geometrical Device with Spur Wheel and Rubber Mat Board. Set includes: 11-1/2 x 9-3/4 board with rubber mat, a protractor with swing-arm, a compass, spur wheel, a ruler and two triangle shaped rulers, all with inch marks depicted in Braille. This is a great learning tool for blind students learning about geometry, mathematics or engineering.