Blocksurf California Twin Fin Set for Soft Board INCLUDES: (2) Black fins and (4) screws EASY TO USE: Simply pop the fins into place and get back to surfing MEASUREMENTS: Distance between screw holes on skeg: 4 inches / Skeg length from front to back along the base: 5 inches / Skeg height from base to tip: 3.5 inches MAX BOARD THICKNESS FOR USE: 2.75 inches HIGH QUALITY: Durable and built to last