Fastening device system

A fastening device system for connecting a first mat having a first tab with a first connecting hole to a second mat having a second tab with a second connecting hole, wherein the connecting holes have a width and a length that is greater than the width, the fastening device system comprising:

• a housing having a first half attachable to a second half to form an outer surface outline, wherein the housing has a body portion configured to fit through the first and second connecting holes and a lip that extends beyond the circumference of the connecting holes;
• a bore extending vertically through the body portion of the housing, the bore having a bottom, a wall, and at least one helical channel in the wall;
• and
• a pin having a head end configured to be manipulated by a user, a shaft with at least one helical shelf extending from the shaft such that the shaft is configured to fit within the bore and the helical shelf is configured to fit within the helical channel, and a foot end that fits through the first and second connecting holes, but when rotated is wider than the width of the connecting holes such that when the housing is inserted into the first and second connecting holes and the pin is rotated the first tab is pressed down by the lip and the second tab is pushed up by the foot end,
• wherein the lip has a tapered thru-hole extending between the top of the housing and the bore, wherein the head end of the pin resides substantially within the tapered thru-hole, and
• wherein the housing has an outer surface and wherein the lip has at least one drainage hole extending from the thru-hole to the outer surface of the housing.