Product#: TG-3900 Availability: This item normally ships within 1 - 2 business days. Description: Coil is approximately 1 7/16” outside diameter and 1 1/4” long with a 1/2” core. For intermittent use only in a 115 volt, 60 cycle AC hookup. Supplied with clamp for attachment to heads. Also supplied with wires and plugs to hook to timer.