After a successful launch of our 1/2 in. medium gray version, we are pleased to introduce the 1/4 in. Small Gray Crack-Stix Permanent Concrete Joint and Crack Filler. This is the only permanent filler for concrete joints and cracks. This product originated from federally specified highway jobs but the only difference is you do not need a 200 Gal. melter to apply it. Crack-Stix is permanent because it is applied with heat (a simple hand held torch) and it bonds to the sidewalls of the joint. Concrete cracks and joints open up because they expand and contract with freeze or thaw cycles - but Crack-Stix will expand and contract right along with mother nature. Small Crack-Stix is designed for joints and cracks 1/4 in. to 1/2 in. in Dia.