Pin

1. A pin comprising

a tool engagement portion and a resiliently deformable cover arranged over the tool engagement portion, wherein:

the resiliently deformable cover is operable to deform from a first raised position to a second lowered position to allow for the engagement of the tool engagement portion with a tool,

the resiliently deformable cover in the first position comprises a ridge of resiliently deformable material,

the ridge is a thickest portion of a top wall of the cover relative to other portions of the top wall of the cover radially outside the ridge; and

the ridge extending at least partially around substantially the periphery of the tool engagement portion.

2. The pin according to claim 1 , wherein the resiliently deformable cover provides a substantially smooth surface in the first position.

3. The pin according to claim 1 , wherein the pin includes a head and a shank, one face of the head includes the tool engagement portion and the resiliently deformable cover is operable in the first position to provide a substantially smooth surface over said face of the head of the pin.

4. The pin according to claim 1 , wherein the pin further comprises a lip, wherein the lip engages with the resiliently deformable cover such that the cover is overstretched.

5. The pin according to claim 1 , wherein the resiliently deformable cover is in the form of a cap, wherein the cap forms a tight abutting fit around the pin.

6. The pin according to claim 1 , wherein the resiliently deformable cover has a thickness and deforms to the lowered position by moving at least three times the thickness.

7. The pin according to claim 1 , wherein the tool engagement portion comprises a recess.

8. The pin according to claim 7 , wherein the recess of the tool engagement portion has a substantially curved perimeter.

9. The pin according to claim 7 , wherein the recess extends along substantially the whole longitudinal length of the pin.

10. The pin according to claim 1 , wherein the pin further comprises bayonet locking means operable to secure the pin in position upon locking rotation of the pin.

11. The pin according to claim 1 , wherein the pin is configured to be secured to a sheath, the sheath operable to be inserted in the opposite end of the aperture through which the pin is to be inserted, or operable to be inserted through an aperture substantially opposite the aperture through which the pin is to be inserted, and wherein upon locking rotation of the pin within the sheath the pin is secured in position.

12. The pin according to claim 11 , wherein the sheath comprises a flanged closed end.

13. The pin according to claim 1 , wherein the resiliently deformable cover is in the form of a cap that is formed of the top wall and a skirt extending perpendicularly from an edge of the top wall.

14. A kit of parts comprising a pin according to claim 1 , and a tool operable to engage the tool engagement portion of the pin such that, when engaged, rotation of the tool causes rotation of the pin.

15. A kit of parts according to claim 14 , wherein the tool comprises projections operable to limit the depth of the insertion of the tool into the tool engagement portion of the pin, in use.