Sheet fastener

A sheet fastener for fastening a pair of sheet edges, the sheet fastener comprising:

• a first member comprising:
• a first fixing portion configured to engage a first edge of the pair of sheet edges;
• and
• a holder continuous with the first fixing portion, wherein the holder defines a first recess and comprises a projection and a support portion, wherein the projection and the support portion define an opening to the first recess;
• and
• a second member comprising:
• a second fixing portion configured to engage a second edge of the pair of sheet edges;
• and
• a head continuous with the second fixing portion, wherein the head comprises a front edge opposite from the second fixing portion and a head surface extending from the second fixing portion to the front edge, wherein:
• the head of the second member is insertable into the first recess of the holder such that a portion of the head surface maintains contact with the projection of the holder,
• the support portion of the holder extends from a connecting portion of the holder, and the projection of the holder extends from the connecting portion in a direction opposite from the support portion,
• the first member includes a step portion between the first fixing portion and the holder and continuous with the first fixing portion and the holder, and
• the step portion offsets the connecting portion of the holder such that an entirety of the holder is above or below the first fixing portion of the first member, and
• the support portion includes a support portion edge, and the support portion edge contacts the second fixing portion.