[1388] & [1389]. Hexagon and square heads for ordinary spanners.

[1390]. Form of head requiring special spanner or pointed bar.

[Larger plate.]

[1391]. Cylinder head bolt, with drilled holes and special spanner.

[1392]. Cylinder head, but with flutes instead of holes for spanner.

[1393]. Cylinder head, but with two flats cut on the head to suit an ordinary spanner.

[1394]. Socket head, to receive a second screw.

[1395]. Eye bolt.

[1396]. Thumb screw.