The LH0652 HH Fluorescent 3-1226XW-2 is a non-shunted, T8-T12 low profile lampholder / socket / tombstone. It has a 22mm lamp axis, and is for G13 medium base LED and fluorescent tubular lamps. Palnut and Screw sold seperately, see 365AP and 365DPH. The LH0652 is similar or equal to the Leviton 13351.
Link to T8, T10, or T12 lamps that fit this socket