See Pictures: Eimac Tube Socket Model SK-510...Fits either a (3-1000 or 4-1000) Tube. In Good Condition! - BONUS: Included are (4) of the glass chimney guides/clips that the SK-516 Chimney sits over. - $60.00 Shipped to USA. Paypal, USPS M/O See my other ad's. Contact me at: firstname.lastname@example.org Thanks!