The Lamp Holders Are Used to Update your Fluorescent T12HO or T8 fixture
Unshunted, Push Fit, Compressible HO/VHO Lamp Holder/Socket With Horizontal Contacts
Rated 660 Watts and 600 Volts, Accepts up to 18 Gauge Solid or Tinned Leads
Directly connect with the fluorescent & LED tube lamp
Package Included:10 Pairs R17D Tombstone Socket (with logo screened on)