Slab:
(concrete). A term referring to a flat area of concrete.

http://www.bradcosupply.com/lumber_dictionary.aspx

“Interlocking Cap” for CRACK-A-SLAB provides for expansion and contraction while forming a water resistant seal. Cap allows you to create and seal the joint all in one step!

CRACK-A-SLAB is manufactured from 20 guage galvanized steel and can be sold in custom lengths from 2ft to 25ft. When inserted into freshly placed concrete, CRACK-A-SLAB will insure that the slab cracks where you want it to!

(can be used with or without the cap)

http://www.formakey.com/Crack-A-Slab/crack-a-slab.html



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Note added at 2 days21 hrs (2006-06-11 07:00:38 GMT)
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Correction: (can be with or without the cap.)

What I meant was the question might refer to Crack-A-Slab without the "cap part".

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Note added at 3 days4 hrs (2006-06-11 14:07:44 GMT)
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Note "#0658 Removable cap" here:

http://www.formakey.com/Plastic_Caps/plastic_caps.html