The Shankha (Conch shell) and Chakra (Wheel) are two of Vishnu's attributes. While these implements are carried by Vishnu, they can be found as separate cast items. These would be kept in the inner sanctum next to the deity, Vishnu. This is not a matched pair.

Estimated age is late 19th century
Dimensions: 5.25" H x 3.375" W x 1.125" D
Weight: 7 ounces
Origin: Karnataka or Tamil Nadu, India
Material: copper alloy
Provenance: Property of a Private Collector

These two pieces are in good condition with evenly patinated metal.