Given the creativity of human beings one can expect every possible combination of design elements to be tried. Here a normally Pegboard- and Slatwall-mount Anti-Theft Hook is found in a crossover application on slotted backbar. How secure is it? I did not test. But there has been at least one comment on this style of locking hook before. See the baseline anti-theft posts immediately below..

For more on this Bar Fixture SEE…
“Slotted Bar Mounts on Slot Wall”

For anti-theft basics SEE…
“Baseline Anti-Theft Hook“
“Anti-Theft Fixture Failure.”
“Baseline Anti-Sweep Hook”
“Rack Meters Items One at a Time“
“Pick Cards on Common Display Hooks”
“Universal Pick Card Holder”

For designer security fixtures SEE…
“Prada Anti Theft Hook”
“Fendi Finial as Branding and Anti-Theft”
“Designer Belts on Lockdown”
“Designer Anti Sweep Hooks“

For noteworthy mainstream anti-theft SEE…
“Locking Wall Fixture for Guitars“
“Diminutive Anti-Sweep Hook”
“Disk Offers Anti-Sweep Potential“
“Locking Security Cart in Jewelry“
“Radical Wrap-back Security Hook”
“Call Button Cuts Retail Theft?”

For less appropriate anti-theft uses SEE…
“Double Locking Theft Protection“
“Display Shouts ‘Don’t Buy“
“Anti Planogram Anti Theft Hook“
“Land Mines As Retail Anti-Theft?”
“Double Locking Theft Protection“
“Caged Maximun Security for Hooks”

For outright anti-theft humor SEE…
“Zip Tie Security Hooks“
“Anti-Theft Window Dressing“
“Anti-Amenity: Don’t Trespass or Sit Here“
“Homemade Anti-Sweep Hook“

For all posts in this category SELECT
“Anti Theft / Security Fixtures” from the Categories Menu

For interesting slot and slotwall posts see…
“Slot Board vs Pegboard“
“Re-thinking Hook Design for Slots”
“Squared-Slot Jewelry Display”
“Slotted Panel Has Rear Recess”
“Slot Wall With Custom Fixtures”
“Slotwall and Label Strip Both Curve”
“Slot Bar Mounted Over Slotwall”
“Slotted Bar a Fashion Trend”
“A Season for All-Wire Slot Hooks”
“Squared-Slot Multi-Hook for Socks”
“Hooks Slip Straight Into Slots”
“Hook Saddle Mounts Slots Not Bar”
“Socks, Slots, Slats and J-Hooks”
“Corrugated Display Sports Slots”
“Slot Mount vs Hole Mount Hook”
“Slot Mount Rectangular Bar Arms”
“Slotted Upright Uses Slatwall Hooks”
“Single Prong Slotwall Bra Display“
“Micro Slot Shoe Ledge”
“Micro Slot Hook for Jewelry“
“Slotted Faux Surface”
“Shoe Ledge Clings to Metal Mesh“
“Hat Ledge for Slot”
“Branded Slot-Mount Hat Tray.”
“Anti-Theft Hook Used on Slotwall“
“Freestanding Slot Tower Concept“
“2011 World’s Smallest Slotwall Display Award“

SEARCH “Crossover” to see fixtures designed for one purpose
and used for another like this Pegboard/Slatwall crossover to Slot..