A device for fixing to a bone in a growth plate area, said device comprising: • a rigid body comprising two elongate openings (3a, 3b) each elongate opening having a longitudinal axis (4a, 4b) and a width (w1, w2); • a first portion of the rigid body comprising one of the two elongate openings and having a first distal end, and a second portion of the rigid body comprising the other of the two elongate openings and having a second distal end, where distal refers relatively to a center of the device, the first portion and the second portion being connected to each other at a position proximal to the distal ends (11, 12), wherein the first portion and the second portion both has a center line; wherein said device is configured such that • a first screw having essentially the same or a smaller diameter as the width (wi) of the first elongated opening is configured to allow travelling, during longitudinal growth, along the longitudinal axis of the first elongated opening when said first screw is inserted in the first elongate opening, and • a second screw having essentially the same or smaller diameter as the width (w 2) of the second elongated opening is configured to allow travelling, during longitudinal growth, along the longitudinal axis of the second elongated opening when said second screw is inserted in the second elongate opening, characterized in that • the longitudinal axis of the two elongate openings (3a, 3b) are ∘ offset from each other in a direction of the width of the elongate openings, and ∘ orientated in directions which are at the most 5 degrees different from each other, such as being parallel, and • said center lines being offset from each other in a direction of the width of the elongate openings (3a, 3b). • a rigid body comprising two elongate openings (3a, 3b) each elongate opening having a longitudinal axis (4a, 4b) and a width (w1, w2); • a first portion of the rigid body comprising one of the two elongate openings and having a first distal end, and a second portion of the rigid body comprising the other of the two elongate openings and having a second distal end, where distal refers relatively to a center of the device, the first portion and the second portion being connected to each other at a position proximal to the distal ends (11, 12), wherein the first portion and the second portion both has a center line; • a first screw having essentially the same or a smaller diameter as the width (wi) of the first elongated opening is configured to allow travelling, during longitudinal growth, along the longitudinal axis of the first elongated opening when said first screw is inserted in the first elongate opening, and • a second screw having essentially the same or smaller diameter as the width (w 2) of the second elongated opening is configured to allow travelling, during longitudinal growth, along the longitudinal axis of the second elongated opening when said second screw is inserted in the second elongate opening, • the longitudinal axis of the two elongate openings (3a, 3b) are ∘ offset from each other in a direction of the width of the elongate openings, and ∘ orientated in directions which are at the most 5 degrees different from each other, such as being parallel, and ∘ offset from each other in a direction of the width of the elongate openings, and ∘ orientated in directions which are at the most 5 degrees different from each other, such as being parallel, and • said center lines being offset from each other in a direction of the width of the elongate openings (3a, 3b).