Stanley Tools is commemorating the 50th anniversary of its PowerLock tape measure line with a limited edition series of five tape measures featuring unique designs dedicated to important highlights in the Powerlock tape measure’s history.

The tributes include a replication of the original “Life Guard Yellow” Powerlock design; a celebration of “Made in the USA” with global materials; a testament to its inclusion in the Apollo 11 lunar landing gear; an homage to the famous Powerlock moniker “Badge of the Professional”; and a nod to Stanley’s legacy of invention.

The classic D-shaped PowerLock design was introduced in 1963 with the world’s first coilable spring and sliding lock, which continue to be the core of modern-day designs. In the 50 years since it was launched, the PowerLock tape measure is one of the best-selling tapes in the world, according to the company.

“We are excited to celebrate our heritage of innovation and proud of the fact it continues to be manufactured with global materials in the original plant here in New Britain, Conn.,” Stanley’s global product manager Tom Chang said in a statement.

A new tape measure will be available every three months and the fifth one will be free with purchase of the first four. Each tape will sell for approximately $9.99.

For information, visit www.stanleytools.com.