The Area 419 bolt knob is meticulously engineered to enhance your shooting experience in both competitive and general use scenarios. It features a signature finger groove, expertly crafted for seamless bolt manipulation using just your pointer finger. The intuitive design ensures your finger naturally aligns with the groove, allowing for the quickest and most fluid bolt operation possible. Additionally, two strategically placed knurled surfaces on either side of the groove provide a secure and confident grip. Whether in competition or at the range, the Area 419 bolt knob offers unparalleled performance and reliability. Manufactured in the USA using 6061-T6 aluminum and finished with a flat black anodization The bolt knobs for defiance and Remington are threaded with a 5/16-24 thread pattern The Remington knobs measure 1-5/8 inches in length to fit shorter bolt handles