DimensionsDiameter: 1.285″ (3.264 cm) Thickness: 0.070″ (0.178 cm) Maximum reading ranges : ProxPoint™ reader up to 1.0″ (2.5 cm) MiniProx™ reader up to 2″ (5 cm) ThinLine II® reader up to 1.5″ (3.7 cm) ProxPro® reader up to 3″ (7.5 cm) MaxiProx® reader up to 4.5″ (11.4 cm) Depending on local installation conditions. DimensionsDiameter: 1.285″ (3.264 cm)Thickness: 0.070″ (0.178 cm)