This is an Ara rod holder. The rod angle can be adjusted to 7 different levels. The rod rest swings and has a built-in spring. The position can be adjusted forward and backward by changing the bolts. The butt box sizes are: Front: 58 x 40 mm Rear: 58 x 30 mm Depth: 59 mm The pin holes for the butt end are 9 mm in diameter, located 20 mm and 35 mm from the front. A rod keeper can be attached after removing the box. The anchor bolt hole diameter is 13 mm. Total length: 370 mm Weight: 2.7 kg The person in the photo weighs 70 kg. The rod is a Daiwa Carbon Whisker Senkaku 100-gou 484. The rod and reel are not included. Please check the butt box size before purchasing.