Driftmasters Pro Rod Holders hold tighter the harder the fish pull. Fully adjustable and constructed of plated steel with a durable plastic coating to protect your rods, these reliable Driftmaster Pro and Lil Pro Rod Holders are designed to hold the rod at the optimal hook-setting angle. Flatliner-25 Left-Thread. 1/2 Threads. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Rod Holder.