Aluminum 90 Degree base for: Tracker Versatrack and Grizzly - Lund - Lowe - Ranger - Qwest Angler- Ambush HEAVY DUTY SMACKDOWN APPROVED! The Smackdown Heavy Duty Aluminum Rod Holder LOCKDOWN Bases for 90-degree rails. Now in FIVE Powder-Coated Colors: Black, Red, Neon Green, Royal Blue and Orange Made in the USA with American aluminum. Fits 1/2" #13 thread Rod Holders. Includes mounting hardware. When screwing in your Rod Holders, there is NO hole going through the bottom of the base, therefore the Rod Holder will not go through the base and damage your rails!