CT-457 Fine Wire Gap Setting Tool Designed exclusively for adjusting fine wire electrode spark plug gaps. Two sizes of slots fit all platinum or iridium ground electrodes for quick, safe adjustment. Red plastic case. Size 2 1/4 in. X 2 in. X 1/4 in./5.7 X 5.0 X 0.63cm. Packed individually, weight 1/2 oz./14g.