The 4" Chiseled Slate liner insert fits a common 2x4 so has an actual height of 3.5 inches. 

Very versatile.  Use them for edges of patios and drives, bold countertop edges, seatwall caps, firepits, and more.

• 8' long, with detailed ends to match.
• Up to 3/4 inches of relief. 
• Lightly caulk or tack to outer form.
• Reuse many, many times.
• 10lbs each.
• Almost seamless when run end to end