What are these ritual objects?
The vajra (Tibetan: Dorjie) and bell (Sanskrit: ghanta; Tibetan: drilbu) are the most important ritual objects of Tibetan Buddhism. Most every lama has a pair and knows how to use them. They represent “method” (vajra) and “wisdom” (bell). Combined together they symbolize enlightenment as they embody the union of all dualities: bliss and emptiness, compassion and wisdom, appearance and reality, conventional truth and ultimate truth, and male and female, etc.
https://www.khanacademy.org/humanities/art-asia/himalayas/tibet/a/thunderbolt-and-bell#:~:text=Vajra is a Sanskrit word,both internal and external enemies.