This is a stainless steel rod holder. The rod angle can be adjusted to 7 different levels. The rod rest section has a built-in spring and swings. Also, by changing the mounting position, it can be adjusted forward and backward. The butt box sizes are: Front: 59mm x 40mm Rear: 59mm x 30mm Depth: 60mm The pin holes for the butt end are 9mm holes located 20mm and 35mm from the front. You can attach a rod keeper by removing the box. The anchor bolt holes are 13mm. The person in the photo holding the rod weighs 70kg. The rod used is a Daiwa Carbon Whisker Senkaku 100-gou 484. The rod, reel, and rod keeper are not included. Please check the butt box size before purchasing.