ProKey

PRO-KEY™

Cat #	Slab	A	B	C	Knockout
3500	4″	3 1/8″	2″	3/4″	7/8″
4500	5″	4 1/8″	2 1/2″	3/4″	7/8″
5500	6″	5 1/8″	3″	3/4″	7/8″
7500	8″	7 1/8″	4″	3/4″	1 1/4″
9500	10″-12″	9 1/8″	5″	3/4″	1 1/4″

Positive stake-to-key lock of PRO-KEY™ [Patent No. 5380122] prevents costly delays associated with resetting key joint when floating concrete. Stakes interlock with slots to prevent the key from rising off the stakes.
Location of the key is 1/2 depth of slab as specified by ACI & PCA.
LOCK SLOT™ stakes double as a butt splice.
Radius formed key eliminates the sharp angles that produce a spalling tendency.
ULTRA FINE profile at top edge eliminates surface voids, reduces spalling and produces architecturally pleasing joint lines in the finished slab.
Tongue and groove design provide excellent load transfer characteristics for heavy wheeled traffic and prevents uneven settling associated with aggregate interlock.
Eliminates costly form stripping and saw cutting. Replaces the slow and costly method of checker-board placement of concrete.