HPM Fluorescent lamholder tombstone style with 7/32 diagonal holes. Twist in to hold the batten. It has screwed terminal. Robust design to last. They are popular products for retrofit projects. They could be used for a variety of fixtures to accomodate almost any lamp. Bases include medium bi pin, end snap in, G5, G13, and single pin. Choose holders and sockets for T5s, T8s, T10s and T12s. Ideal for residential or commercial applications.