Avantree SG188 Bluetooth Smart Audio Sunglasses for Men, UV400 Protection & Polarized Glasses, Sports & Cycling, Open Ear

Q: Can i used these to replace my Safety glasses?

No I don't think you can. These glasses are for listening music ect. Via Bluetooth.

Q: Are these hands free to make a call?

Unfortunately, you have to make the call from the phone. Or through your iPad then you may talk through the sunglasses themselves at least that is with Apple products. I also have found that redialing the last number called is possible through the sunglasses or Siri can call the number